diff --git a/common/src/main/java/net/rzdata/demo/trait/IConverter.java b/common/src/main/java/net/rzdata/demo/trait/IConverter.java
new file mode 100644
index 0000000..7afe46f
--- /dev/null
+++ b/common/src/main/java/net/rzdata/demo/trait/IConverter.java
@@ -0,0 +1,11 @@
+package net.rzdata.demo.trait;
+
+/**
+ * 实体转换类
+ * @param <S> 源类型
+ * @param <T> 目标类型
+ */
+public interface IConverter<S, T> {
+
+    T convert(S source);
+}
diff --git a/common/src/main/java/net/rzdata/demo/trait/IQuery.java b/common/src/main/java/net/rzdata/demo/trait/IQuery.java
new file mode 100644
index 0000000..faa8344
--- /dev/null
+++ b/common/src/main/java/net/rzdata/demo/trait/IQuery.java
@@ -0,0 +1,10 @@
+package net.rzdata.demo.trait;
+
+/**
+ * 请求实体类
+ * @param <T> 核心模型类型
+ */
+public interface IQuery<T> {
+
+    T into();
+}