diff --git a/chain/src/chain.rs b/chain/src/chain.rs
index 1c94d85ef3..b83e8a8b76 100644
--- a/chain/src/chain.rs
+++ b/chain/src/chain.rs
@@ -138,7 +138,13 @@ impl ChainController {
 
     // Relay need this
     pub fn get_orphan_block(&self, hash: &Byte32) -> Option<BlockView> {
-        todo!("load orphan block")
+        if self.orphan_block_broker.exist(hash){
+            // TODO we should store BlockView in memory when CKB node not in IBD mode (Relay protocol need load orphan block)
+            // store orphan blocks to RocksDB only when CKB node in IBD mode
+            todo!("load orphan block")
+            return Some();
+        }
+        None
     }
 }
 
diff --git a/chain/src/orphan_block_pool.rs b/chain/src/orphan_block_pool.rs
index ead446d3ca..a4a8c2f234 100644
--- a/chain/src/orphan_block_pool.rs
+++ b/chain/src/orphan_block_pool.rs
@@ -1,10 +1,24 @@
 use ckb_logger::debug;
 use ckb_types::core::EpochNumber;
+use ckb_types::packed::Byte32;
 use ckb_types::{core, packed};
 use ckb_util::{parking_lot::RwLock, shrink_to_fit};
 use std::collections::{HashMap, HashSet, VecDeque};
 
 pub type ParentHash = packed::Byte32;
+pub struct OrphanBlockId(ParentHash, packed::Byte32);
+
+impl OrphanBlockId {
+    pub fn new(parent_hash: ParentHash, block_hash: Byte32) -> Self {
+        OrphanBlockId(parent_hash, block_hash)
+    }
+    pub fn parent_hash(&self) -> ParentHash {
+        self.0.clone()
+    }
+    pub fn block_hash(&self) -> ParentHash {
+        self.1.clone()
+    }
+}
 
 const SHRINK_THRESHOLD: usize = 100;
 const EXPIRED_EPOCH: u64 = 6;
@@ -12,7 +26,7 @@ const EXPIRED_EPOCH: u64 = 6;
 #[derive(Default)]
 struct InnerPool {
     // Group by blocks in the pool by the parent hash.
-    blocks: HashMap<ParentHash, HashMap<packed::Byte32, core::BlockView>>,
+    blocks: HashMap<ParentHash, HashSet<Byte32>>,
     // The map tells the parent hash when given the hash of a block in the pool.
     //
     // The block is in the orphan pool if and only if the block hash exists as a key in this map.
@@ -30,13 +44,13 @@ impl InnerPool {
         }
     }
 
-    fn insert(&mut self, block: core::BlockView) {
-        let hash = block.header().hash();
-        let parent_hash = block.data().header().raw().parent_hash();
+    fn insert(&mut self, block: OrphanBlockId) {
+        let hash = block.hash();
+        let parent_hash = block.parent_hash();
         self.blocks
             .entry(parent_hash.clone())
             .or_insert_with(HashMap::default)
-            .insert(hash.clone(), block);
+            .insert(hash.clone());
         // Out-of-order insertion needs to be deduplicated
         self.leaders.remove(&hash);
         // It is a possible optimization to make the judgment in advance,
@@ -50,7 +64,7 @@ impl InnerPool {
         self.parents.insert(hash, parent_hash);
     }
 
-    pub fn remove_blocks_by_parent(&mut self, parent_hash: &ParentHash) -> Vec<core::BlockView> {
+    pub fn remove_blocks_by_parent(&mut self, parent_hash: &ParentHash) -> Vec<OrphanBlockId> {
         // try remove leaders first
         if !self.leaders.remove(parent_hash) {
             return Vec::new();
@@ -59,7 +73,7 @@ impl InnerPool {
         let mut queue: VecDeque<packed::Byte32> = VecDeque::new();
         queue.push_back(parent_hash.to_owned());
 
-        let mut removed: Vec<core::BlockView> = Vec::new();
+        let mut removed: Vec<OrphanBlockId> = Vec::new();
         while let Some(parent_hash) = queue.pop_front() {
             if let Some(orphaned) = self.blocks.remove(&parent_hash) {
                 let (hashes, blocks): (Vec<_>, Vec<_>) = orphaned.into_iter().unzip();
@@ -84,14 +98,22 @@ impl InnerPool {
         removed
     }
 
-    pub fn get_block(&self, hash: &packed::Byte32) -> Option<core::BlockView> {
+    pub fn exist(&self, hash: &packed::Byte32) -> bool {
         self.parents.get(hash).and_then(|parent_hash| {
             self.blocks
                 .get(parent_hash)
-                .and_then(|blocks| blocks.get(hash).cloned())
+                .and_then(|blocks| blocks.get(hash).is_some())
         })
     }
 
+    // pub fn get_block(&self, hash: &packed::Byte32) -> Option<OrphanBlockId> {
+    //     self.parents.get(hash).and_then(|parent_hash| {
+    //         self.blocks
+    //             .get(parent_hash)
+    //             .and_then(|blocks| blocks.get(hash).cloned())
+    //     })
+    // }
+
     /// cleanup expired blocks(epoch + EXPIRED_EPOCH < tip_epoch)
     pub fn clean_expired_blocks(&mut self, tip_epoch: EpochNumber) -> Vec<packed::Byte32> {
         let mut result = vec![];
@@ -100,7 +122,7 @@ impl InnerPool {
             if self.need_clean(hash, tip_epoch) {
                 // remove items in orphan pool and return hash to callee(clean header map)
                 let descendants = self.remove_blocks_by_parent(hash);
-                result.extend(descendants.iter().map(|block| block.hash()));
+                result.extend(descendants.iter().map(|block| block.block_hash()));
             }
         }
         result
@@ -135,16 +157,20 @@ impl OrphanBlockPool {
     }
 
     /// Insert orphaned block, for which we have already requested its parent block
-    pub fn insert(&self, block: core::BlockView) {
+    pub fn insert(&self, block: OrphanBlockId) {
         self.inner.write().insert(block);
     }
 
-    pub fn remove_blocks_by_parent(&self, parent_hash: &ParentHash) -> Vec<core::BlockView> {
+    pub fn remove_blocks_by_parent(&self, parent_hash: &ParentHash) -> Vec<OrphanBlockId> {
         self.inner.write().remove_blocks_by_parent(parent_hash)
     }
 
-    pub fn get_block(&self, hash: &packed::Byte32) -> Option<core::BlockView> {
-        self.inner.read().get_block(hash)
+    // pub fn get_block(&self, hash: &packed::Byte32) -> Option<core::BlockView> {
+    //     self.inner.read().get_block(hash)
+    // }
+
+    pub fn exist(&self, hash: &packed::Byte32) -> bool {
+        self.inner.read().exist(hash)
     }
 
     pub fn clean_expired_blocks(&self, epoch: EpochNumber) -> Vec<packed::Byte32> {