diff --git a/pkg/structure/define/define.go b/pkg/structure/define/define.go
new file mode 100644
index 0000000..57c3969
--- /dev/null
+++ b/pkg/structure/define/define.go
@@ -0,0 +1 @@
+package define
diff --git a/pkg/structure/define/interface.go b/pkg/structure/define/interface.go
new file mode 100644
index 0000000..2d308cf
--- /dev/null
+++ b/pkg/structure/define/interface.go
@@ -0,0 +1,22 @@
+package define
+
+type CacheValue interface {
+	LengthByte() int64
+}
+
+type ParseComm func(comm string) ([]string, error)
+
+type CacheStruct interface {
+	SizeByte() int64
+
+	// RollBack 事务相关
+	RollBack() error
+	Begin() error
+	Comment() error
+
+	ParseCommend(comm ParseComm) ([]string, error)
+	GetValue(opt ...string) CacheValue
+	SetValue(opt ...string) error
+
+	Encode() ([]byte, error)
+}