diff --git a/CHANGELOG.md b/CHANGELOG.md
index d72c7df614..fe90c27729 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ Please mark all change in change log and use the issue from GitHub
 
 ## Feature
 -   \#1655 GPU index support delete vectors
+-   \#1825 Add annoy index type in C++ sdk
 
 ## Improvement
 
diff --git a/sdk/examples/utils/Utils.cpp b/sdk/examples/utils/Utils.cpp
index 3da618aa03..ad698609fa 100644
--- a/sdk/examples/utils/Utils.cpp
+++ b/sdk/examples/utils/Utils.cpp
@@ -94,6 +94,8 @@ Utils::IndexTypeName(const milvus::IndexType& index_type) {
         case milvus::IndexType::IVFPQ:return "IVFPQ";
         case milvus::IndexType::SPTAGKDT:return "SPTAGKDT";
         case milvus::IndexType::SPTAGBKT:return "SPTAGBKT";
+        case milvus::IndexType::HNSW:return "HNSW";
+        case milvus::IndexType::ANNOY:return "ANNOY";
         default:return "Unknown index type";
     }
 }
diff --git a/sdk/include/MilvusApi.h b/sdk/include/MilvusApi.h
index 67f3771623..9bc585c54e 100644
--- a/sdk/include/MilvusApi.h
+++ b/sdk/include/MilvusApi.h
@@ -35,6 +35,7 @@ enum class IndexType {
     SPTAGKDT = 7,
     SPTAGBKT = 8,
     HNSW = 11,
+    ANNOY = 12,
 };
 
 enum class MetricType {