diff --git a/source/dnode/vnode/src/vnd/vnodeRead.c b/source/libs/tkv/src/inc/tkvBtree.h
similarity index 72%
rename from source/dnode/vnode/src/vnd/vnodeRead.c
rename to source/libs/tkv/src/inc/tkvBtree.h
index 5e9f89ccd5568042e7dfd1d369a2e2849f678cce..6360e62c79fda0a2ce2af0163d4fc0c45fbf296a 100644
--- a/source/dnode/vnode/src/vnd/vnodeRead.c
+++ b/source/libs/tkv/src/inc/tkvBtree.h
@@ -13,4 +13,21 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "vnodeDef.h"
\ No newline at end of file
+#ifndef _TD_TKV_BTREE_H_
+#define _TD_TKV_BTREE_H_
+
+#include "tkvDef.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+  pgid_t root;  // root page number
+} STkvBtree;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_TKV_BTREE_H_*/
\ No newline at end of file
diff --git a/source/libs/tkv/src/inc/tkvDB.h b/source/libs/tkv/src/inc/tkvDB.h
index 1a45702540728eb166cc172315002ca1c90408f1..fc8219db3fdcf3d9460077174aeb522ee6df7626 100644
--- a/source/libs/tkv/src/inc/tkvDB.h
+++ b/source/libs/tkv/src/inc/tkvDB.h
@@ -16,12 +16,26 @@
 #ifndef _TD_TKV_DB_H_
 #define _TD_TKV_DB_H_
 
+#include "tkvBtree.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+typedef enum {
+  TDB_BTREE = 0,
+  TDB_HASH,
+  TDB_HEAP,
+} tdb_db_t;
+
 struct TDB {
-  // TODO
+  pgsize_t pageSize;
+
+  tdb_db_t type;  // DB type
+
+  union {
+    STkvBtree btree;
+  } dbimpl;
 };
 
 #ifdef __cplusplus
diff --git a/source/dnode/vnode/src/inc/vnodeRead.h b/source/libs/tkv/src/inc/tkvHash.h
similarity index 81%
rename from source/dnode/vnode/src/inc/vnodeRead.h
rename to source/libs/tkv/src/inc/tkvHash.h
index 5ce84b2ebf3d5127cb4ed15b83d050779296033e..06343b7ac9da32339fd9c34cbd54231914a099dd 100644
--- a/source/dnode/vnode/src/inc/vnodeRead.h
+++ b/source/libs/tkv/src/inc/tkvHash.h
@@ -13,18 +13,21 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _TD_VNODE_READ_H_
-#define _TD_VNODE_READ_H_
+#ifndef _TD_TKV_HAHS_H_
+#define _TD_TKV_HAHS_H_
+
+#include "tkvDef.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
-#include "vnodeInt.h"
 
-void vnodeProcessReadMsg(SVnode *pVnode, SVnodeMsg *pMsg);
+typedef struct STkvHash {
+  // TODO
+} STkvHash;
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif /*_TD_VNODE_READ_H_*/
+#endif /*_TD_TKV_HAHS_H_*/
\ No newline at end of file