diff --git a/core/src/dog_segment/Collection.cpp b/core/src/dog_segment/Collection.cpp
index b45b82d60d..c7028988a8 100644
--- a/core/src/dog_segment/Collection.cpp
+++ b/core/src/dog_segment/Collection.cpp
@@ -11,7 +11,4 @@ Collection::set_index() {}
 void
 Collection::parse() {}
 
-void
-Collection::AddNewPartition() {}
-
 }
diff --git a/core/src/dog_segment/Collection.h b/core/src/dog_segment/Collection.h
index 2ad0b47634..4c24257b3d 100644
--- a/core/src/dog_segment/Collection.h
+++ b/core/src/dog_segment/Collection.h
@@ -15,15 +15,19 @@ public:
     // TODO: config to schema
     void parse();
 
-    void AddNewPartition();
+public:
+    SchemaPtr& get_schema() {
+      return schema_;
+    }
 
 private:
     // TODO: add Index ptr
     // IndexPtr index_ = nullptr;
     std::string collection_name_;
     std::string schema_json_;
-    milvus::dog_segment::SchemaPtr schema_;
-    std::vector<PartitionPtr> partitions_;
+    SchemaPtr schema_;
 };
 
+using CollectionPtr = std::unique_ptr<Collection>;
+
 }
diff --git a/core/src/dog_segment/Partition.cpp b/core/src/dog_segment/Partition.cpp
index cd31a5ca50..0772e02f0a 100644
--- a/core/src/dog_segment/Partition.cpp
+++ b/core/src/dog_segment/Partition.cpp
@@ -2,19 +2,7 @@
 
 namespace milvus::dog_segment {
 
-Partition::Partition(std::string& partition_name):
-      partition_name_(partition_name) {}
-
-void
-Partition::AddNewSegment(uint64_t segment_id) {
-  auto segment = CreateSegment();
-  segment->set_segment_id(segment_id);
-  segments_.emplace_back(segment);
-}
-
-Partition*
-CreatePartition() {
-
-}
+Partition::Partition(std::string& partition_name, SchemaPtr& schema):
+      partition_name_(partition_name), schema_(schema) {}
 
 }
diff --git a/core/src/dog_segment/Partition.h b/core/src/dog_segment/Partition.h
index bea4f26276..86ef0059de 100644
--- a/core/src/dog_segment/Partition.h
+++ b/core/src/dog_segment/Partition.h
@@ -6,21 +6,18 @@ namespace milvus::dog_segment {
 
 class Partition {
 public:
-    explicit Partition(std::string& partition_name);
+    explicit Partition(std::string& partition_name, SchemaPtr& schema);
 
-    const std::vector<SegmentBasePtr> &segments() const {
-      return segments_;
+public:
+    SchemaPtr& get_schema() {
+      return schema_;
     }
 
-    void AddNewSegment(uint64_t segment_id);
-
 private:
     std::string partition_name_;
-    std::vector<SegmentBasePtr> segments_;
+    SchemaPtr schema_;
 };
 
-using PartitionPtr = std::shared_ptr<Partition>;
-
-Partition* CreatePartiton();
+using PartitionPtr = std::unique_ptr<Partition>;
 
 }
\ No newline at end of file
diff --git a/core/src/dog_segment/SegmentBase.h b/core/src/dog_segment/SegmentBase.h
index 03abaa29a0..84afcc8d93 100644
--- a/core/src/dog_segment/SegmentBase.h
+++ b/core/src/dog_segment/SegmentBase.h
@@ -102,12 +102,9 @@ class SegmentBase {
     uint64_t segment_id_;
 };
 
-using SegmentBasePtr = std::shared_ptr<SegmentBase>;
+using SegmentBasePtr = std::unique_ptr<SegmentBase>;
 
-std::unique_ptr<SegmentBase> CreateSegment(SchemaPtr ptr);
-
-// TODO: Delete this after schema parse function done
-SegmentBase* CreateSegment();
+SegmentBasePtr CreateSegment(SchemaPtr& ptr);
 
 }  // namespace engine
 }  // namespace milvus
diff --git a/core/src/dog_segment/SegmentNaive.cpp b/core/src/dog_segment/SegmentNaive.cpp
index 08821d03b6..c245bbe67c 100644
--- a/core/src/dog_segment/SegmentNaive.cpp
+++ b/core/src/dog_segment/SegmentNaive.cpp
@@ -128,11 +128,8 @@ class SegmentNaive : public SegmentBase {
     }
 
  public:
-    friend std::unique_ptr<SegmentBase>
-    CreateSegment(SchemaPtr schema);
-
-    friend SegmentBase*
-    CreateSegment();
+    friend SegmentBasePtr
+    CreateSegment(SchemaPtr& schema);
 
  private:
     SchemaPtr schema_;
@@ -147,22 +144,17 @@ class SegmentNaive : public SegmentBase {
     tbb::concurrent_unordered_multimap<int, Timestamp> delete_logs_;
 };
 
-std::unique_ptr<SegmentBase>
-CreateSegment(SchemaPtr schema) {
-    auto segment = std::make_unique<SegmentNaive>();
-    segment->schema_ = schema;
-    segment->entity_vecs_.resize(schema->size());
-    return segment;
-}
+SegmentBasePtr
+CreateSegment(SchemaPtr& schema) {
+    // TODO: remove hard code
+    auto schema_tmp = std::make_shared<Schema>();
+    schema_tmp->AddField("fakevec", DataType::VECTOR_FLOAT, 16);
+    schema_tmp->AddField("age", DataType::INT32);
 
-SegmentBase* CreateSegment() {
-  auto segment = new SegmentNaive();
-  auto schema = std::make_shared<Schema>();
-  schema->AddField("fakevec", DataType::VECTOR_FLOAT, 16);
-  schema->AddField("age", DataType::INT32);
-  segment->schema_ = schema;
-  segment->entity_vecs_.resize(schema->size());
-  return segment;
+    auto segment = std::make_unique<SegmentNaive>();
+    segment->schema_ = schema_tmp;
+    segment->entity_vecs_.resize(schema_tmp->size());
+    return segment;
 }
 
 Status
diff --git a/core/src/dog_segment/collection_c.cpp b/core/src/dog_segment/collection_c.cpp
index 4ba3fc5618..a0ff4ade0a 100644
--- a/core/src/dog_segment/collection_c.cpp
+++ b/core/src/dog_segment/collection_c.cpp
@@ -1,11 +1,19 @@
 #include "collection_c.h"
+#include "Collection.h"
 
 CCollection
-NewCollection(const char* collection_name) {
+NewCollection(const char* collection_name, const char* schema_conf) {
+  auto name = std::string(collection_name);
+  auto conf = std::string(schema_conf);
 
+  auto collection = std::make_unique<milvus::dog_segment::Collection>(name, conf);
+
+  return (void*)collection.release();
 }
 
 void
 DeleteCollection(CCollection collection) {
+  auto col = (milvus::dog_segment::Collection*)collection;
 
+  delete col;
 }
diff --git a/core/src/dog_segment/collection_c.h b/core/src/dog_segment/collection_c.h
index fd4a96f118..02ae2c854e 100644
--- a/core/src/dog_segment/collection_c.h
+++ b/core/src/dog_segment/collection_c.h
@@ -4,7 +4,7 @@ extern "C" {
 
 typedef void* CCollection;
 
-CCollection NewCollection(const char* collection_name);
+CCollection NewCollection(const char* collection_name, const char* schema_conf);
 
 void DeleteCollection(CCollection collection);
 
diff --git a/core/src/dog_segment/partition_c.cpp b/core/src/dog_segment/partition_c.cpp
index a40b4e30eb..89336fcf70 100644
--- a/core/src/dog_segment/partition_c.cpp
+++ b/core/src/dog_segment/partition_c.cpp
@@ -4,9 +4,19 @@
 
 CPartition
 NewPartition(CCollection collection, const char* partition_name) {
-  auto name = std::string(partition_name);
-  auto partition = new milvus::dog_segment::Partition(name);
+  auto c = (milvus::dog_segment::Collection*)collection;
 
-  auto co = (milvus::dog_segment::Collection*)collection;
-  co->AddNewPartition();
+  auto name = std::string(partition_name);
+
+  auto schema = c->get_schema();
+
+  auto partition = std::make_unique<milvus::dog_segment::Partition>(name, schema);
+
+  return (void*)partition.release();
+}
+
+void DeletePartition(CPartition partition) {
+  auto p = (milvus::dog_segment::Partition*)partition;
+
+  delete p;
 }
diff --git a/core/src/dog_segment/segment_c.cpp b/core/src/dog_segment/segment_c.cpp
index f337c4babd..22a1e47b41 100644
--- a/core/src/dog_segment/segment_c.cpp
+++ b/core/src/dog_segment/segment_c.cpp
@@ -1,25 +1,23 @@
 #include "SegmentBase.h"
 #include "segment_c.h"
+#include "Partition.h"
 
 CSegmentBase
-SegmentBaseInit(unsigned long segment_id) {
-  std::cout << "Hello milvus" << std::endl;
-  auto seg = milvus::dog_segment::CreateSegment();
-  seg->set_segment_id(segment_id);
-  return (void*)seg;
+NewSegment(CPartition partition, unsigned long segment_id) {
+  auto p = (milvus::dog_segment::Partition*)partition;
+
+  auto segment = milvus::dog_segment::CreateSegment(p->get_schema());
+
+  segment->set_segment_id(segment_id);
+
+  return (void*)segment.release();
 }
 
-//int32_t Insert(CSegmentBase c_segment, signed long int size, const unsigned long* primary_keys, const unsigned long int* timestamps, DogDataChunk values) {
-//  auto segment = (milvus::dog_segment::SegmentBase*)c_segment;
-//  milvus::dog_segment::DogDataChunk dataChunk{};
-//
-//  dataChunk.raw_data = values.raw_data;
-//  dataChunk.sizeof_per_row = values.sizeof_per_row;
-//  dataChunk.count = values.count;
-//
-//  auto res = segment->Insert(size, primary_keys, timestamps, dataChunk);
-//  return res.code();
-//}
+void DeleteSegment(CSegmentBase segment) {
+  auto s = (milvus::dog_segment::SegmentBase*)segment;
+
+  delete s;
+}
 
 int Insert(CSegmentBase c_segment,
                signed long int size,
diff --git a/core/src/dog_segment/segment_c.h b/core/src/dog_segment/segment_c.h
index 1be07d4ff6..3ebe9c1bda 100644
--- a/core/src/dog_segment/segment_c.h
+++ b/core/src/dog_segment/segment_c.h
@@ -2,17 +2,13 @@
 extern "C" {
 #endif
 
-//struct DogDataChunk {
-//    void* raw_data;      // schema
-//    int sizeof_per_row;  // alignment
-//    signed long int count;
-//};
+#include "partition_c.h"
 
 typedef void* CSegmentBase;
 
-CSegmentBase SegmentBaseInit(unsigned long segment_id);
+CSegmentBase NewSegment(CPartition partition, unsigned long segment_id);
 
-//int32_t Insert(CSegmentBase c_segment, signed long int size, const unsigned long* primary_keys, const unsigned long int* timestamps, DogDataChunk values);
+void DeleteSegment(CSegmentBase segment);
 
 int Insert(CSegmentBase c_segment,
                 signed long int size,
diff --git a/core/unittest/test_c_api.cpp b/core/unittest/test_c_api.cpp
index f2843182c5..b9993a280f 100644
--- a/core/unittest/test_c_api.cpp
+++ b/core/unittest/test_c_api.cpp
@@ -2,13 +2,14 @@
 #include <string>
 #include <random>
 #include <gtest/gtest.h>
+#include <dog_segment/SegmentBase.h>
 
 #include "dog_segment/segment_c.h"
 #include "dog_segment/collection_c.h"
 
 TEST(SegmentTest, InsertTest) {
-  auto segment_id = 0;
-  auto s = SegmentBaseInit(segment_id);
+  auto fake_schema = std::make_shared<milvus::dog_segment::Schema>();
+  auto s = milvus::dog_segment::CreateSegment(fake_schema).release();
 
   std::vector<char> raw_data;
   std::vector<uint64_t> timestamps;
diff --git a/reader/collection.go b/reader/collection.go
index dfe7945756..fb4d0ae72e 100644
--- a/reader/collection.go
+++ b/reader/collection.go
@@ -11,28 +11,28 @@ type Collection struct {
 	Partitions []*Partition
 }
 
-// TODO: Schema
-type CollectionSchema string
-
-func NewCollection(collectionName string, schema CollectionSchema) (*Collection, error) {
-	cName := C.CString(collectionName)
-	cSchema := C.CString(schema)
-	collection, status := C.NewCollection(cName, cSchema)
+func (c *Collection) NewPartition(partitionName string) (*Partition, error) {
+	cName := C.CString(partitionName)
+	partitionPtr, status := C.NewPartition(c.CollectionPtr, cName)
 
 	if status != 0 {
-		return nil, errors.New("create collection failed")
+		return nil, errors.New("create partition failed")
 	}
 
-	return &Collection{CollectionPtr: collection, CollectionName: collectionName}, nil
+	var newPartition = &Partition{PartitionPtr: partitionPtr, PartitionName: partitionName}
+	c.Partitions = append(c.Partitions, newPartition)
+	return newPartition, nil
 }
 
-func DeleteCollection(collection *Collection) error {
-	status := C.DeleteCollection(collection.CollectionPtr)
+func (c *Collection) DeletePartition(partitionName string) error {
+	cName := C.CString(partitionName)
+	status := C.DeletePartition(c.CollectionPtr, cName)
 
 	if status != 0 {
-		return errors.New("delete collection failed")
+		return errors.New("create partition failed")
 	}
 
+	// TODO: remove from c.Partitions
 	return nil
 }
 
diff --git a/reader/partition.go b/reader/partition.go
index 97b698d8a9..f6c921606a 100644
--- a/reader/partition.go
+++ b/reader/partition.go
@@ -9,24 +9,25 @@ type Partition struct {
 	Segments []*Segment
 }
 
-func (c *Collection) NewPartition(partitionName string) (*Partition, error) {
-	cName := C.CString(partitionName)
-	partitionPtr, status := C.NewPartition(c.CollectionPtr, cName)
+func (p *Partition) NewSegment(segmentId uint64) (*Segment, error) {
+	segmentPtr, status := C.NewSegment(p.PartitionPtr, segmentId)
 
 	if status != 0 {
-		return nil, errors.New("create partition failed")
+		return nil, errors.New("create segment failed")
 	}
 
-	return &Partition{PartitionPtr: partitionPtr, PartitionName: partitionName}, nil
+	var newSegment = &Segment{SegmentPtr: segmentPtr, SegmentId: segmentId}
+	p.Segments = append(p.Segments, newSegment)
+	return newSegment, nil
 }
 
-func (c *Collection) DeletePartition(partitionName string) error {
-	cName := C.CString(partitionName)
-	status := C.DeletePartition(c.CollectionPtr, cName)
+func (p *Partition) DeleteSegment() error {
+	status := C.DeleteSegment(p.PartitionPtr)
 
 	if status != 0 {
-		return errors.New("create partition failed")
+		return errors.New("delete segment failed")
 	}
 
+	// TODO: remove from p.Segments
 	return nil
 }
diff --git a/reader/query_node.go b/reader/query_node.go
index dc6a8b2265..0dfc19e8d8 100644
--- a/reader/query_node.go
+++ b/reader/query_node.go
@@ -48,7 +48,38 @@ func NewQueryNode(timeSync uint64) *QueryNode {
 	}
 }
 
-func (node *QueryNode)doQueryNode(wg *sync.WaitGroup) {
+// TODO: Schema
+type CollectionSchema string
+
+func (node *QueryNode) NewCollection(collectionName string, schema CollectionSchema) (*Collection, error) {
+	cName := C.CString(collectionName)
+	cSchema := C.CString(schema)
+	collection, status := C.NewCollection(cName, cSchema)
+
+	if status != 0 {
+		return nil, errors.New("create collection failed")
+	}
+
+	var newCollection = &Collection{CollectionPtr: collection, CollectionName: collectionName}
+	node.Collections = append(node.Collections, newCollection)
+
+	return newCollection, nil
+}
+
+func (node *QueryNode) DeleteCollection(collection *Collection) error {
+	status := C.DeleteCollection(collection.CollectionPtr)
+
+	if status != 0 {
+		return errors.New("delete collection failed")
+	}
+
+	// TODO: remove from node.Collections
+	return nil
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////
+
+func (node *QueryNode) doQueryNode (wg *sync.WaitGroup) {
 	wg.Add(3)
 	go node.Insert(node.messageClient.InsertMsg, wg)
 	go node.Delete(node.messageClient.DeleteMsg, wg)
@@ -67,12 +98,6 @@ func (node *QueryNode) StartMessageClient() {
 	go node.messageClient.ReceiveMessage()
 }
 
-func (node *QueryNode) AddNewCollection(collectionName string, schema CollectionSchema) error {
-	var collection, err = NewCollection(collectionName, schema)
-	node.Collections = append(node.Collections, collection)
-	return err
-}
-
 func (node *QueryNode) GetSegmentByEntityId(entityId int64) *Segment {
 	// TODO: get id2segment info from pulsar
 	return nil
@@ -115,13 +140,11 @@ func (node *QueryNode) GetTimeSync() uint64 {
 
 func (node *QueryNode) InitQueryNodeCollection() {
 	// TODO: remove hard code, add collection creation request
-	var collection, _ = NewCollection("collection1", "fakeSchema")
-	node.Collections = append(node.Collections, collection)
-	var partition, _ = collection.NewPartition("partition1")
-	collection.Partitions = append(collection.Partitions, partition)
+	// TODO: error handle
+	var newCollection, _ = node.NewCollection("collection1", "fakeSchema")
+	var newPartition, _ = newCollection.NewPartition("partition1")
 	// TODO: add segment id
-	var segment, _ = partition.NewSegment(0)
-	partition.Segments = append(partition.Segments, segment)
+	var _, _ = newPartition.NewSegment(0)
 }
 
 func (node *QueryNode) SegmentsManagement() {
diff --git a/reader/segment.go b/reader/segment.go
index 45dcd6cceb..4cafb2165e 100644
--- a/reader/segment.go
+++ b/reader/segment.go
@@ -11,7 +11,6 @@ package reader
 */
 import "C"
 import (
-	"errors"
 	"suvlim/pulsar/schema"
 )
 
@@ -23,27 +22,6 @@ type Segment struct {
 	SegmentCloseTime uint64
 }
 
-func (p *Partition) NewSegment(segmentId uint64) (*Segment, error) {
-	// TODO: add segment id
-	segmentPtr, status := C.SegmentBaseInit(p.PartitionPtr)
-
-	if status != 0 {
-		return nil, errors.New("create segment failed")
-	}
-
-	return &Segment{SegmentPtr: segmentPtr}, nil
-}
-
-func (p *Partition) DeleteSegment() error {
-	status := C.DeleteSegment(p.PartitionPtr)
-
-	if status != 0 {
-		return errors.New("delete segment failed")
-	}
-
-	return nil
-}
-
 func (s *Segment) GetRowCount() int64 {
 	// TODO: C type to go type
 	return C.GetRowCount(s)