diff --git a/source/libs/tkv/inc/tDiskMgr.h b/source/libs/tkv/inc/tDiskMgr.h
index ff6e0b6ab78a6eb282a8dde986ffe001348f0f76..03622284f46b7c9271e90ead33e6ce55b24ac135 100644
--- a/source/libs/tkv/inc/tDiskMgr.h
+++ b/source/libs/tkv/inc/tDiskMgr.h
@@ -22,10 +22,14 @@ extern "C" {
 
 #include "os.h"
 
+#include "tkvDef.h"
+
 typedef struct SDiskMgr SDiskMgr;
 
-int     tdmReadPage(SDiskMgr *pDiskMgr, int32_t pgid, void *pData);
-int     tdmWritePage(SDiskMgr *pDiskMgr, int32_t pgid, const void *pData);
+int     tdmOpen(SDiskMgr **ppDiskMgr, const char *fname, uint16_t pgsize);
+int     tdmClose(SDiskMgr *pDiskMgr);
+int     tdmReadPage(SDiskMgr *pDiskMgr, pgid_t pgid, void *pData);
+int     tdmWritePage(SDiskMgr *pDiskMgr, pgid_t pgid, const void *pData);
 int32_t tdmAllocPage(SDiskMgr *pDiskMgr);
 
 #ifdef __cplusplus
diff --git a/source/libs/tkv/inc/tPage.h b/source/libs/tkv/inc/tPage.h
new file mode 100644
index 0000000000000000000000000000000000000000..0546f6184fb4c46bb1ade4744d8f835373f582a5
--- /dev/null
+++ b/source/libs/tkv/inc/tPage.h
@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2019 TAOS Data, Inc. <jhtao@taosdata.com>
+ *
+ * This program is free software: you can use, redistribute, and/or modify
+ * it under the terms of the GNU Affero General Public License, version 3
+ * or later ("AGPL"), as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _TD_TKV_PAGE_H_
+#define _TD_TKV_PAGE_H_
+
+#include "os.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+typedef struct {
+  uint16_t dbver;
+  uint16_t pgsize;
+  uint32_t cksm;
+} SPgHdr;
+
+typedef struct {
+  SPgHdr   chdr;
+  uint16_t used;     // number of used slots
+  uint16_t loffset;  // the offset of the starting location of the last slot used
+} SSlottedPgHdr;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /*_TD_TKV_PAGE_H_*/
\ No newline at end of file
diff --git a/source/libs/tkv/inc/tkvMacro.h b/source/libs/tkv/inc/tkvDef.h
similarity index 81%
rename from source/libs/tkv/inc/tkvMacro.h
rename to source/libs/tkv/inc/tkvDef.h
index 6e3458c0215569810bddf9ccfb89c73acb487580..6f1072abd5cc7dec529c837d4d0e6cbb8c96e14f 100644
--- a/source/libs/tkv/inc/tkvMacro.h
+++ b/source/libs/tkv/inc/tkvDef.h
@@ -13,15 +13,21 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef _TD_TKV_MACRO_H_
-#define _TD_TKV_MACRO_H_
+#ifndef _TD_TKV_DEF_H_
+#define _TD_TKV_DEF_H_
+
+#include "os.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+// pgid_t
+typedef int32_t pgid_t;
+#define TKV_IVLD_PGID ((pgid_t)-1)
+
 #ifdef __cplusplus
 }
 #endif
 
-#endif /*_TD_TKV_MACRO_H_*/
\ No newline at end of file
+#endif /*_TD_TKV_DEF_H_*/
\ No newline at end of file
diff --git a/source/libs/tkv/src/tDiskMgr.c b/source/libs/tkv/src/tDiskMgr.c
index dfdfd1f96bbcf8d8169432b07aba45200cd6befc..d759171f853b5077caa36de814535e63a8faaa3a 100644
--- a/source/libs/tkv/src/tDiskMgr.c
+++ b/source/libs/tkv/src/tDiskMgr.c
@@ -24,13 +24,23 @@ struct SDiskMgr {
 
 #define PAGE_OFFSET(PGID, PGSIZE) ((PGID) * (PGSIZE))
 
-int tdmReadPage(SDiskMgr *pDiskMgr, int32_t pgid, void *pData) {
+int tdmOpen(SDiskMgr **ppDiskMgr, const char *fname, uint16_t pgsize) {
+  // TODO
+  return 0;
+}
+
+int tdmClose(SDiskMgr *pDiskMgr) {
+  // TODO
+  return 0;
+}
+
+int tdmReadPage(SDiskMgr *pDiskMgr, pgid_t pgid, void *pData) {
   taosLSeekFile(pDiskMgr->fd, PAGE_OFFSET(pgid, pDiskMgr->pgsize), SEEK_SET);
   taosReadFile(pDiskMgr->fd, pData, pDiskMgr->pgsize);
   return 0;
 }
 
-int tdmWritePage(SDiskMgr *pDiskMgr, int32_t pgid, const void *pData) {
+int tdmWritePage(SDiskMgr *pDiskMgr, pgid_t pgid, const void *pData) {
   taosLSeekFile(pDiskMgr->fd, PAGE_OFFSET(pgid, pDiskMgr->pgsize), SEEK_SET);
   taosWriteFile(pDiskMgr->fd, pData, pDiskMgr->pgsize);
   return 0;
diff --git a/source/libs/tkv/test/tDiskMgrTest.cpp b/source/libs/tkv/test/tDiskMgrTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..a735fdb33d08ee673bcbb80d7f9822643b2d3366
--- /dev/null
+++ b/source/libs/tkv/test/tDiskMgrTest.cpp
@@ -0,0 +1,10 @@
+#include "gtest/gtest.h"
+
+#include "iostream"
+
+#include "tDiskMgr.h"
+
+TEST(tDiskMgrTest, simple_test) {
+  // TODO
+  std::cout << "This is in tDiskMgrTest::simple_test" << std::endl;
+}
\ No newline at end of file