diff --git a/src/table/iterator_wrapper.rs b/src/table/iterator_wrapper.rs
new file mode 100644
index 0000000000000000000000000000000000000000..e9f849327424f6eba489109f08bf2557e3fd2259
--- /dev/null
+++ b/src/table/iterator_wrapper.rs
@@ -0,0 +1,3 @@
+pub struct IteratorWrapper {
+
+}
\ No newline at end of file
diff --git a/src/table/mod.rs b/src/table/mod.rs
index d0e015761c328ff1877f66324062a402b3a2ee33..ade478fc4045f8c85b832af1adda4f74d428e097 100644
--- a/src/table/mod.rs
+++ b/src/table/mod.rs
@@ -4,4 +4,5 @@ pub mod filter_block;
 pub mod format;
 mod format_test;
 pub(crate) mod ss_table;
-mod ss_table_test;
\ No newline at end of file
+mod ss_table_test;
+mod iterator_wrapper;
\ No newline at end of file
diff --git a/src/traits/iterator.rs b/src/traits/iterator.rs
index 3e327f3aea7d35f34f0dac3ec5c7aabf0bc2579f..7717574de82560f01aac082d4790953581d0b93c 100644
--- a/src/traits/iterator.rs
+++ b/src/traits/iterator.rs
@@ -1,21 +1,110 @@
 use crate::util::slice::Slice;
 
 pub trait DataIterator {
-
+    /// 检查当前位置是否有效
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: bool
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn valid(&self) -> bool;
-
+    /// 将迭代器定位到开始位置
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: ()
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn seek_to_first(&mut self);
-
+    /// 将迭代器定位到末尾位置
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: ()
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn seek_to_last(&mut self);
-
+    /// 将迭代器定位到指定位置
+    ///
+    /// # Arguments
+    ///
+    /// * `target`: 迭代器位置
+    ///
+    /// returns: ()
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn seek(&mut self, target: &Slice);
-
+    /// 定位到下一个元素
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: ()
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn next(&mut self);
-
+    /// 定位到上一个元素
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: ()
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn pre(&mut self);
-
+    /// 获取key值
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: Slice
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn key(&self) -> &Slice;
-
+    /// 获取value值
+    ///
+    /// # Arguments
+    ///
+    ///
+    /// returns: Slice
+    ///
+    /// # Examples
+    ///
+    /// ```
+    ///
+    /// ```
     fn value(&self) -> &Slice;
 
 }