diff --git a/internal/rootcoord/alter_collection_task.go b/internal/rootcoord/alter_collection_task.go
index e48f7bf332..da07298021 100644
--- a/internal/rootcoord/alter_collection_task.go
+++ b/internal/rootcoord/alter_collection_task.go
@@ -34,6 +34,7 @@ import (
 	"github.com/milvus-io/milvus/pkg/v2/log"
 	"github.com/milvus-io/milvus/pkg/v2/mq/msgstream"
 	"github.com/milvus-io/milvus/pkg/v2/proto/querypb"
+	"github.com/milvus-io/milvus/pkg/v2/util/funcutil"
 	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 )
 
@@ -47,6 +48,10 @@ func (a *alterCollectionTask) Prepare(ctx context.Context) error {
 		return errors.New("alter collection failed, collection name does not exists")
 	}
 
+	if funcutil.SliceContain(a.Req.GetDeleteKeys(), common.EnableDynamicSchemaKey) {
+		return merr.WrapErrParameterInvalidMsg("cannot delete key %s, dynamic field schema could support set to true/false", common.EnableDynamicSchemaKey)
+	}
+
 	return nil
 }
 
diff --git a/internal/rootcoord/alter_collection_task_test.go b/internal/rootcoord/alter_collection_task_test.go
index d9d5b607d7..24f5d85795 100644
--- a/internal/rootcoord/alter_collection_task_test.go
+++ b/internal/rootcoord/alter_collection_task_test.go
@@ -33,6 +33,7 @@ import (
 	mockrootcoord "github.com/milvus-io/milvus/internal/rootcoord/mocks"
 	"github.com/milvus-io/milvus/pkg/v2/common"
 	"github.com/milvus-io/milvus/pkg/v2/mq/msgstream"
+	"github.com/milvus-io/milvus/pkg/v2/util/merr"
 )
 
 func Test_alterCollectionTask_Prepare(t *testing.T) {
@@ -42,6 +43,17 @@ func Test_alterCollectionTask_Prepare(t *testing.T) {
 		assert.Error(t, err)
 	})
 
+	t.Run("banned_delete_keys", func(t *testing.T) {
+		task := &alterCollectionTask{Req: &milvuspb.AlterCollectionRequest{
+			Base:           &commonpb.MsgBase{MsgType: commonpb.MsgType_AlterCollection},
+			CollectionName: "test_collection",
+			DeleteKeys:     []string{common.EnableDynamicSchemaKey},
+		}}
+		err := task.Prepare(context.Background())
+		assert.Error(t, err)
+		assert.ErrorIs(t, err, merr.ErrParameterInvalid)
+	})
+
 	t.Run("normal case", func(t *testing.T) {
 		task := &alterCollectionTask{
 			Req: &milvuspb.AlterCollectionRequest{