diff --git a/internal/datacoord/index_service.go b/internal/datacoord/index_service.go
index 6139306e2bb0f..d039bf20ae9e4 100644
--- a/internal/datacoord/index_service.go
+++ b/internal/datacoord/index_service.go
@@ -282,6 +282,15 @@ func (s *Server) CreateIndex(ctx context.Context, req *indexpb.CreateIndexReques
 }
 
 func ValidateIndexParams(index *model.Index) error {
+	if err := CheckDuplidateKey(index.IndexParams, "indexParams"); err != nil {
+		return err
+	}
+	if err := CheckDuplidateKey(index.UserIndexParams, "userIndexParams"); err != nil {
+		return err
+	}
+	if err := CheckDuplidateKey(index.TypeParams, "typeParams"); err != nil {
+		return err
+	}
 	indexType := GetIndexType(index.IndexParams)
 	indexParams := funcutil.KeyValuePair2Map(index.IndexParams)
 	userIndexParams := funcutil.KeyValuePair2Map(index.UserIndexParams)
@@ -300,6 +309,17 @@ func ValidateIndexParams(index *model.Index) error {
 	return nil
 }
 
+func CheckDuplidateKey(kvs []*commonpb.KeyValuePair, tag string) error {
+	keySet := typeutil.NewSet[string]()
+	for _, kv := range kvs {
+		if keySet.Contain(kv.GetKey()) {
+			return merr.WrapErrParameterInvalidMsg("duplicate %s key in %s params", kv.GetKey(), tag)
+		}
+		keySet.Insert(kv.GetKey())
+	}
+	return nil
+}
+
 func UpdateParams(index *model.Index, from []*commonpb.KeyValuePair, updates []*commonpb.KeyValuePair) []*commonpb.KeyValuePair {
 	params := make(map[string]string)
 	for _, param := range from {
diff --git a/internal/datacoord/index_service_test.go b/internal/datacoord/index_service_test.go
index 040fcfe124372..b551a892f260c 100644
--- a/internal/datacoord/index_service_test.go
+++ b/internal/datacoord/index_service_test.go
@@ -2510,4 +2510,55 @@ func TestValidateIndexParams(t *testing.T) {
 		err := ValidateIndexParams(index)
 		assert.Error(t, err)
 	})
+
+	t.Run("duplicated_index_params", func(t *testing.T) {
+		index := &model.Index{
+			IndexParams: []*commonpb.KeyValuePair{
+				{
+					Key:   common.IndexTypeKey,
+					Value: indexparamcheck.AutoIndex,
+				},
+				{
+					Key:   common.IndexTypeKey,
+					Value: indexparamcheck.AutoIndex,
+				},
+			},
+		}
+		err := ValidateIndexParams(index)
+		assert.Error(t, err)
+	})
+
+	t.Run("duplicated_user_index_params", func(t *testing.T) {
+		index := &model.Index{
+			UserIndexParams: []*commonpb.KeyValuePair{
+				{
+					Key:   common.IndexTypeKey,
+					Value: indexparamcheck.AutoIndex,
+				},
+				{
+					Key:   common.IndexTypeKey,
+					Value: indexparamcheck.AutoIndex,
+				},
+			},
+		}
+		err := ValidateIndexParams(index)
+		assert.Error(t, err)
+	})
+
+	t.Run("duplicated_user_index_params", func(t *testing.T) {
+		index := &model.Index{
+			TypeParams: []*commonpb.KeyValuePair{
+				{
+					Key:   common.IndexTypeKey,
+					Value: indexparamcheck.AutoIndex,
+				},
+				{
+					Key:   common.IndexTypeKey,
+					Value: indexparamcheck.AutoIndex,
+				},
+			},
+		}
+		err := ValidateIndexParams(index)
+		assert.Error(t, err)
+	})
 }