diff --git a/core/state/sample_kv.go b/core/state/sample_kv.go
new file mode 100644
index 00000000..44087267
--- /dev/null
+++ b/core/state/sample_kv.go
@@ -0,0 +1,70 @@
+package state
+
+import (
+	"github.com/yu-org/yu/core/types"
+	"github.com/yu-org/yu/infra/storage/kv"
+)
+
+type SampleKV struct {
+	kvdb kv.KV
+}
+
+func (s *SampleKV) Set(triName NameString, key, value []byte) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) Delete(triName NameString, key []byte) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) Get(triName NameString, key []byte) ([]byte, error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) GetFinalized(triName NameString, key []byte) ([]byte, error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) Exist(triName NameString, key []byte) bool {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) GetByBlockHash(triName NameString, key []byte, block *types.Block) ([]byte, error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) Commit() ([]byte, error) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) NextTxn() {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) Discard() {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) DiscardAll() {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) StartBlock(block *types.Block) {
+	//TODO implement me
+	panic("implement me")
+}
+
+func (s *SampleKV) FinalizeBlock(block *types.Block) {
+	//TODO implement me
+	panic("implement me")
+}