diff --git a/src/db/db_format.rs b/src/db/db_format.rs
index 1af9eefafc00903e21c6888f9e1b2c5ff486a6b2..7dccd9724fff4a2d3b5b801c642a76ddfea60711 100644
--- a/src/db/db_format.rs
+++ b/src/db/db_format.rs
@@ -41,11 +41,9 @@ pub enum ValueType {
     K_TYPE_VALUE,
 }
 
-// typedef uint64_t SequenceNumber;
-
 pub struct ParsedInternalKey {
     user_key: Slice,
-    // sequence: SequenceNumber,
+    sequence: u64,
     value_type: ValueType
 }
 
@@ -93,6 +91,7 @@ impl Default for ParsedInternalKey {
     fn default() -> Self {
         ParsedInternalKey {
             user_key: Default::default(),
+            sequence: 0,
             value_type: K_TYPE_DELETION,
         }
     }
@@ -102,6 +101,7 @@ impl ParsedInternalKey {
     fn new(u: Slice, /* seq: SequenceNumber, */ t: ValueType) -> ParsedInternalKey {
         ParsedInternalKey {
             user_key: u,
+            sequence: 0,
             value_type: t,
         }
     }
diff --git a/src/db/table_cache.rs b/src/db/table_cache.rs
index 5713d1962b09728a421f7314c0e71c1961c6b7b8..ad6079bddebb55f87430bf04a6d0f08f777b0e91 100644
--- a/src/db/table_cache.rs
+++ b/src/db/table_cache.rs
@@ -45,7 +45,7 @@ impl TableCache {
     /// ```
     ///
     /// ```
-    fn evict(&self, _file_number: u64) {
+    fn evict(&mut self, _file_number: u64) {
         todo!()
     }
 
diff --git a/src/table/block.rs b/src/table/block.rs
index 3aa9b0c2bdb80b3c9e382f38c2047ebc1a9b6dba..564b7725135f598d95323009c88285334f77c3b0 100644
--- a/src/table/block.rs
+++ b/src/table/block.rs
@@ -18,11 +18,11 @@ impl Block {
     pub fn size(&self) {
         todo!()
     }
-    ///
+    /// 生成迭代器
     ///
     /// # Arguments
     ///
-    /// * `_comparator`:
+    /// * `_comparator`: 比较器
     ///
     /// returns: Result<Box<dyn DataIterator, Global>, Status>
     ///
diff --git a/src/table/block_builder.rs b/src/table/block_builder.rs
index d5f8b810874944a75088f19d4f8c47663d05beb6..a58922a09598e533c26255af1605d7dcd7362acb 100644
--- a/src/table/block_builder.rs
+++ b/src/table/block_builder.rs
@@ -19,7 +19,7 @@ impl BlockBuilder {
     /// ```
     ///
     /// ```
-    pub fn add(&self, _key: &Slice, _value: &Slice) {
+    pub fn add(&mut self, _key: &Slice, _value: &Slice) {
         todo!()
     }
     /// 重置builder
@@ -29,7 +29,7 @@ impl BlockBuilder {
     /// ```
     /// block_builder.reset();
     /// ```
-    pub fn reset(&self) {
+    pub fn reset(&mut self) {
         todo!()
     }
     /// 构造block
@@ -40,7 +40,7 @@ impl BlockBuilder {
     /// ```
     /// let block = block_builder.finish();
     /// ```
-    pub fn finish(&self) -> Result<Slice> {
+    pub fn finish(&mut self) -> Result<Slice> {
         todo!()
     }
     /// 判断builder是否为空
diff --git a/src/table/filter_block.rs b/src/table/filter_block.rs
index c5a5932a5ec90772fe16026efc6ac24c919fd008..524c324c4c7c82cbfef98718c4f3617e15104828 100644
--- a/src/table/filter_block.rs
+++ b/src/table/filter_block.rs
@@ -18,7 +18,7 @@ impl FilterBlockBuilder {
     /// ```
     /// filter_block_builder.start_block(1024_u64);
     /// ```
-    pub fn start_block(&self, _block_offset: u64) {
+    pub fn start_block(&mut self, _block_offset: u64) {
         todo!()
     }
 
@@ -35,7 +35,7 @@ impl FilterBlockBuilder {
     /// ```
     ///
     /// ```
-    pub fn add_key(&self, _key: &Slice) {
+    pub fn add_key(&mut self, _key: &Slice) {
         todo!()
     }
     /// 构造filterBlock
@@ -45,7 +45,7 @@ impl FilterBlockBuilder {
     /// ```
     /// filter_block_builder.finish();
     /// ```
-    pub fn finish(&self) -> Result<Slice> {
+    pub fn finish(&mut self) -> Result<Slice> {
         todo!()
     }
 }
@@ -53,7 +53,7 @@ impl FilterBlockBuilder {
 pub struct FilterBlockReader {}
 
 impl FilterBlockReader {
-    pub fn key_may_match(&self, _block_offset: u64, _key: &Slice) {
+    pub fn key_may_match(&self, _block_offset: u64, _key: &Slice) -> bool {
         todo!()
     }
 }
\ No newline at end of file
diff --git a/src/table/format.rs b/src/table/format.rs
index 9a64d4b8bbf2d5da987a1838645a74e9da56e6be..d956954d18cf4af447d688db36883eadf46400a4 100644
--- a/src/table/format.rs
+++ b/src/table/format.rs
@@ -2,6 +2,7 @@ use crate::traits::coding_trait::CodingTrait;
 use crate::util::coding;
 use crate::util::slice::Slice;
 use crate::util::Result;
+use crate::util::status::Status;
 
 /// Maximum encoding length of a BlockHandle
 pub const k_max_encoded_length: u32 = 10 + 10;
@@ -44,7 +45,7 @@ pub struct BlockContents {
     heap_allocated:bool,
 }
 
-trait Block {
+trait BlockTrait {
     ///
     /// The offset of the block in the file.
     ///
@@ -81,10 +82,10 @@ trait Block {
     /// ```
     ///
     /// ```
-    fn encode_to(&self) -> Slice;
+    fn encode_to(&self) -> Result<Slice>;
 
     ///
-    /// 将 Slice 对象解码后与BlockHandle比较，是否可以成功
+    /// 将 Slice 对象解码后与BlockHandle set field
     ///
     /// # Arguments
     /// * `input`:
@@ -96,18 +97,18 @@ trait Block {
     /// ```
     ///
     /// ```
-    fn decode_from(&self, input: Slice) -> Result<bool>;
+    fn decode_from(&mut self, input: Slice) -> Result<()>;
 }
 
-trait Foot {
+trait FootTrait {
     // The block handle for the metaindex block of the table
-    fn metaindex_handle() -> BlockHandle;
+    fn metaindex_handle(&self) -> BlockHandle;
 
-    fn set_metaindex_handle(h: BlockHandle);
+    fn set_metaindex_handle(&mut self, h: BlockHandle);
 
-    fn index_handle() -> BlockHandle;
+    fn index_handle(&self) -> BlockHandle;
 
-    fn set_index_handle(h: BlockHandle);
+    fn set_index_handle(&mut self, h: BlockHandle);
 
     ///
     /// 将 Foot 对象编码成 Slice
@@ -121,7 +122,7 @@ trait Foot {
     /// ```
     ///
     /// ```
-    fn encode_to(&self) -> Slice;
+    fn encode_to(&self) -> Result<Slice>;
 
     ///
     /// 将 Slice 对象解码后与 BlockHandle 比较，是否可以成功
@@ -136,13 +137,13 @@ trait Foot {
     /// ```
     ///
     /// ```
-    fn decode_from(&self, input: Slice) -> Result<bool>;
+    fn decode_from(&mut self, input: Slice) -> Result<()>;
 }
 
 trait BlockContent {
     /// Read the block identified by "handle" from "file".  On failure
     /// return non-OK.  On success fill *result and return OK.
-    fn read_block(
+    fn read_block(&self,
         // todo RandomAccessFile, ReadOptions 未提供
         // file: RandomAccessFile, options: ReadOptions,
         handle: BlockHandle
@@ -150,7 +151,7 @@ trait BlockContent {
 
 }
 
-impl Block for BlockHandle {
+impl BlockTrait for BlockHandle {
     fn offset(&self) -> u64 {
         self.offset_
     }
@@ -195,20 +196,20 @@ impl Default for BlockHandle {
     }
 }
 
-impl Foot for Footer {
-    fn metaindex_handle() -> BlockHandle {
+impl FootTrait for Footer {
+    fn metaindex_handle(&self) -> BlockHandle {
         todo!()
     }
 
-    fn set_metaindex_handle(h: BlockHandle) {
+    fn set_metaindex_handle(&self, h: BlockHandle) {
         todo!()
     }
 
-    fn index_handle() -> BlockHandle {
+    fn index_handle(&self) -> BlockHandle {
         todo!()
     }
 
-    fn set_index_handle(h: BlockHandle) {
+    fn set_index_handle(&self, h: BlockHandle) {
         todo!()
     }
 
@@ -222,7 +223,7 @@ impl Foot for Footer {
 }
 
 impl BlockContent for BlockContents {
-    fn read_block(handle: BlockHandle) -> Result<BlockContents> {
+    fn read_block(&self, handle: BlockHandle) -> Result<BlockContents> {
         todo!()
     }
 }
diff --git a/src/table/mod.rs b/src/table/mod.rs
index a91ce21e573ffa2ae8926752bd6db33e35856a35..d0e015761c328ff1877f66324062a402b3a2ee33 100644
--- a/src/table/mod.rs
+++ b/src/table/mod.rs
@@ -3,5 +3,5 @@ pub mod block_builder;
 pub mod filter_block;
 pub mod format;
 mod format_test;
-pub mod ss_table;
+pub(crate) mod ss_table;
 mod ss_table_test;
\ No newline at end of file