diff --git a/.gitignore b/.gitignore
index c4a3f964bba04248575a6549162f349ce88d3bf7..fe34bf0ef8c3d23f0762da9fbdff8458967a2011 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
 build
 .baidu*
 .bcloud*
+output
diff --git a/demo-client/BCLOUD b/demo-client/BCLOUD
index 7f208dea6795c3cae11d4cdea84079c44cff758f..5bd3bfe7278840961aee0f10ec82ab5b48764546 100644
--- a/demo-client/BCLOUD
+++ b/demo-client/BCLOUD
@@ -19,8 +19,10 @@ INCPATHS('$INC')
 INCPATHS('$INC/sdk-cpp')
 INCPATHS('$INC/sdk-cpp/include')
 INCPATHS('$OUT_ROOT/third-64/protobuf/output/include')
+INCPATHS('../kvdb/include')
 
 LIBS('$OUT/lib/libpdconfigure.a')
+LIBS('$OUT/lib/libkvdb.a')
 
 CONFIGS('baidu/base/baidu-rpc@ci-base')
 CONFIGS('baidu/third-party/gflags@v2.0.0@git_branch')
@@ -48,6 +50,7 @@ HEADERS('include/*.hpp', '$INC/sdk-cpp/include')
 Application('ximage', Sources('src/ximage.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
 Application('ximage_press', Sources('src/ximage_press.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
 Application('echo', Sources('src/echo.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
+Application('echo_kvdb', Sources('src/echo_kvdb.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
 Application('dense_format', Sources('src/dense_format.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
 Application('sparse_format', Sources('src/sparse_format.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
 Application('int64tensor_format', Sources('src/int64tensor_format.cpp'), WholeArchives('$OUT/lib/libpdsdk-cpp.a'))
diff --git a/kvdb/include/kvdb/kvdb_impl.h b/kvdb/include/kvdb/kvdb_impl.h
index cc2b96eff87a71a220a69d7c1f42deefb263302e..c7537e65e9151c30333a01440de6eeb6ac1bae55 100644
--- a/kvdb/include/kvdb/kvdb_impl.h
+++ b/kvdb/include/kvdb/kvdb_impl.h
@@ -32,9 +32,10 @@ public:
     virtual void SetDBName(std::string) = 0;
     virtual void Set(std::string key, std::string value) = 0;
     virtual std::string Get(std::string key) = 0;
-    virtual ~AbstractKVDB() = 0;
+    inline virtual ~AbstractKVDB() = 0;
 };
 
+inline  AbstractKVDB::~AbstractKVDB() {}
 // TODO: Implement RedisKVDB
 //class RedisKVDB;
 
@@ -53,6 +54,8 @@ protected:
     std::chrono::system_clock::time_point time_stamp_;
 };
 
+inline  AbstractDictReader::~AbstractDictReader() {}
+
 class AbstractParamDict {
 public:
     virtual std::vector<AbsDictReaderPtr> GetDictReaderLst() = 0;
@@ -77,6 +80,8 @@ protected:
     AbsKVDBPtr front_db, back_db;
 };
 
+inline  AbstractParamDict::~AbstractParamDict() {}
+
 
 class ParamDictMgr {
 public: