diff --git a/src/base_cmd.h b/src/base_cmd.h
index ee87730b9..d26ff339e 100644
--- a/src/base_cmd.h
+++ b/src/base_cmd.h
@@ -76,6 +76,7 @@ const std::string kCmdNameSIsMember = "sismember";
 const std::string kCmdNameSAdd = "sadd";
 const std::string kCmdNameSUnionStore = "sunionstore";
 const std::string kCmdNameSRem = "srem";
+const std::string kCmdNameSCard = "scard";
 
 enum CmdFlags {
   kCmdFlagsWrite = (1 << 0),             // May modify the dataset
diff --git a/src/cmd_set.cc b/src/cmd_set.cc
index b0554c4a4..865f9f23a 100644
--- a/src/cmd_set.cc
+++ b/src/cmd_set.cc
@@ -142,4 +142,26 @@ void SRemCmd::DoCmd(PClient* client) {
   client->AppendInteger(oldSize - unset->size());
 }
 
+SCardCmd::SCardCmd(const std::string& name, int16_t arity)
+    : BaseCmd(name, arity, kCmdFlagsReadonly, kAclCategoryRead | kAclCategorySet) {}
+
+bool SCardCmd::DoInitial(PClient* client) {
+  client->SetKey(client->argv_[1]);
+  return true;
+}
+
+void SCardCmd::DoCmd(PClient* client) {
+  PObject* value = nullptr;
+  PError err = PSTORE.GetValueByType(client->Key(), value, kPTypeSet);
+  if (err != kPErrorOK) {
+    if (err == kPErrorNotExist) {
+      client->AppendInteger(0);
+    } else {
+      client->SetRes(CmdRes::kErrOther);
+    }
+    return;
+  }
+  client->AppendInteger(value->CastSet()->size());
+}
+
 }  // namespace pikiwidb
\ No newline at end of file
diff --git a/src/cmd_set.h b/src/cmd_set.h
index e69417351..45dddaf7e 100644
--- a/src/cmd_set.h
+++ b/src/cmd_set.h
@@ -54,4 +54,15 @@ class SRemCmd : public BaseCmd {
   void DoCmd(PClient *client) override;
 };
 
+class SCardCmd : public BaseCmd {
+ public:
+  SCardCmd(const std::string &name, int16_t arity);
+
+ protected:
+  bool DoInitial(PClient *client) override;
+
+ private:
+  void DoCmd(PClient *client) override;
+};
+
 }  // namespace pikiwidb
diff --git a/src/cmd_table_manager.cc b/src/cmd_table_manager.cc
index 49a283bfc..a5c50c75f 100644
--- a/src/cmd_table_manager.cc
+++ b/src/cmd_table_manager.cc
@@ -80,6 +80,7 @@ void CmdTableManager::InitCmdTable() {
   ADD_COMMAND(SAdd, -3);
   ADD_COMMAND(SUnionStore, -3);
   ADD_COMMAND(SRem, -3);
+  ADD_COMMAND(SCard, 2);
 }
 
 std::pair<BaseCmd*, CmdRes::CmdRet> CmdTableManager::GetCommand(const std::string& cmdName, PClient* client) {