diff --git a/internal/core/src/index/Utils.cpp b/internal/core/src/index/Utils.cpp
index f400d41d99..a3920f55f9 100644
--- a/internal/core/src/index/Utils.cpp
+++ b/internal/core/src/index/Utils.cpp
@@ -18,6 +18,7 @@
 #include <tuple>
 #include <vector>
 #include <functional>
+#include <iostream>
 
 #include "index/Utils.h"
 #include "index/Meta.h"
@@ -127,11 +128,11 @@ GetIndexModeFromConfig(const Config& config) {
 
 IndexMode
 GetIndexMode(const std::string index_mode) {
-    if (index_mode.compare("CPU") != 0) {
+    if (index_mode.compare("CPU") == 0 || index_mode.compare("cpu") == 0) {
         return IndexMode::MODE_CPU;
     }
 
-    if (index_mode.compare("GPU") != 0) {
+    if (index_mode.compare("GPU") == 0 || index_mode.compare("gpu") == 0) {
         return IndexMode::MODE_GPU;
     }
 
diff --git a/internal/core/unittest/test_c_api.cpp b/internal/core/unittest/test_c_api.cpp
index c50da07dfb..1873af6777 100644
--- a/internal/core/unittest/test_c_api.cpp
+++ b/internal/core/unittest/test_c_api.cpp
@@ -1424,7 +1424,7 @@ TEST(CApiTest, LoadIndexInfo) {
     std::string index_param_value1 = "IVF_PQ";
     status = AppendIndexParam(c_load_index_info, index_param_key1.data(), index_param_value1.data());
     std::string index_param_key2 = "index_mode";
-    std::string index_param_value2 = "cpu";
+    std::string index_param_value2 = "CPU";
     status = AppendIndexParam(c_load_index_info, index_param_key2.data(), index_param_value2.data());
     ASSERT_EQ(status.error_code, Success);
     std::string index_param_key3 = knowhere::meta::METRIC_TYPE;
@@ -1578,7 +1578,7 @@ TEST(CApiTest, Indexing_Without_Predicate) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -1699,7 +1699,7 @@ TEST(CApiTest, Indexing_Expr_Without_Predicate) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -1837,7 +1837,7 @@ TEST(CApiTest, Indexing_With_float_Predicate_Range) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -1989,7 +1989,7 @@ TEST(CApiTest, Indexing_Expr_With_float_Predicate_Range) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -2125,7 +2125,7 @@ TEST(CApiTest, Indexing_With_float_Predicate_Term) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -2270,7 +2270,7 @@ TEST(CApiTest, Indexing_Expr_With_float_Predicate_Term) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -2408,7 +2408,7 @@ TEST(CApiTest, Indexing_With_binary_Predicate_Range) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "BIN_IVF_FLAT";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "JACCARD";
 
@@ -2558,7 +2558,7 @@ TEST(CApiTest, Indexing_Expr_With_binary_Predicate_Range) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "BIN_IVF_FLAT";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "JACCARD";
 
@@ -2695,7 +2695,7 @@ TEST(CApiTest, Indexing_With_binary_Predicate_Term) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "BIN_IVF_FLAT";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "JACCARD";
 
@@ -2856,7 +2856,7 @@ TEST(CApiTest, Indexing_Expr_With_binary_Predicate_Term) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "BIN_IVF_FLAT";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "JACCARD";
 
@@ -3016,7 +3016,7 @@ TEST(CApiTest, SealedSegment_search_float_Predicate_Range) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
@@ -3295,7 +3295,7 @@ TEST(CApiTest, SealedSegment_search_float_With_Expr_Predicate_Range) {
     std::string index_type_key = "index_type";
     std::string index_type_value = "IVF_PQ";
     std::string index_mode_key = "index_mode";
-    std::string index_mode_value = "cpu";
+    std::string index_mode_value = "CPU";
     std::string metric_type_key = "metric_type";
     std::string metric_type_value = "L2";
 
diff --git a/internal/querynode/load_index_info_test.go b/internal/querynode/load_index_info_test.go
index 3d8cf459d0..12c62f410e 100644
--- a/internal/querynode/load_index_info_test.go
+++ b/internal/querynode/load_index_info_test.go
@@ -34,7 +34,7 @@ func TestLoadIndexInfo(t *testing.T) {
 	})
 	indexParams = append(indexParams, &commonpb.KeyValuePair{
 		Key:   "index_mode",
-		Value: "cpu",
+		Value: "CPU",
 	})
 	indexParams = append(indexParams, &commonpb.KeyValuePair{
 		Key:   "metric_type",