diff --git a/crates/loro-internal/src/container/registry.rs b/crates/loro-internal/src/container/registry.rs
index 2ca1c2cf..4038cb3d 100644
--- a/crates/loro-internal/src/container/registry.rs
+++ b/crates/loro-internal/src/container/registry.rs
@@ -254,6 +254,11 @@ impl ContainerRegistry {
             .map(|x| Arc::downgrade(&self.containers[x.0 as usize].container))
     }
 
+    #[inline(always)]
+    pub fn contains(&self, id: &ContainerID) -> bool {
+        self.container_to_idx.contains_key(id)
+    }
+
     #[inline(always)]
     pub(crate) fn get_by_idx(&self, idx: ContainerIdx) -> Option<&Arc<Mutex<ContainerInstance>>> {
         self.containers.get(idx.0 as usize).map(|x| &x.container)
diff --git a/crates/loro-internal/src/log_store.rs b/crates/loro-internal/src/log_store.rs
index 19ad029d..930b6b0a 100644
--- a/crates/loro-internal/src/log_store.rs
+++ b/crates/loro-internal/src/log_store.rs
@@ -265,7 +265,12 @@ impl LogStore {
     }
 
     #[inline]
-    pub fn contains(&self, id: ID) -> bool {
+    pub fn contains_container(&self, id: &ContainerID) -> bool {
+        self.reg.contains(id)
+    }
+
+    #[inline]
+    pub fn contains_id(&self, id: ID) -> bool {
         self.changes
             .get(&id.client_id)
             .map_or(0, |changes| changes.atom_len())
diff --git a/crates/loro-internal/src/loro.rs b/crates/loro-internal/src/loro.rs
index 83b2695a..8ecb4dfb 100644
--- a/crates/loro-internal/src/loro.rs
+++ b/crates/loro-internal/src/loro.rs
@@ -1,6 +1,8 @@
 use std::sync::{Arc, Mutex, RwLock};
 
 use crate::{
+    container::ContainerID,
+    dag::DagUtils,
     event::RawEvent,
     hierarchy::Hierarchy,
     log_store::{EncodeConfig, LoroEncoder},
@@ -73,6 +75,11 @@ impl LoroCore {
         Text::from_instance(instance, cid)
     }
 
+    pub fn contains(&self, id: &ContainerID) -> bool {
+        let store = self.log_store.try_read().unwrap();
+        store.contains_container(id)
+    }
+
     // TODO: make it private
     pub fn export(&self, remote_vv: VersionVector) -> FxHashMap<u64, Vec<Change<RemoteOp>>> {
         let store = self.log_store.read().unwrap();