diff --git a/LocalPackages/com.nimin.lowlevel/Runtime/TypedBuffer.cs b/LocalPackages/com.nimin.lowlevel/Runtime/TypedBuffer.cs
new file mode 100644
index 0000000..7245f93
--- /dev/null
+++ b/LocalPackages/com.nimin.lowlevel/Runtime/TypedBuffer.cs
@@ -0,0 +1,51 @@
+using System;
+using Unity.Collections;
+using Unity.Collections.LowLevel.Unsafe;
+
+namespace GameCore.LowLevel
+{
+    public ref struct TypedBuffer<T> where T : unmanaged
+    {
+        public NativeList<byte> buffer;
+
+        public int Length => buffer.Length / UnsafeUtility.SizeOf<T>();
+
+        public TypedBuffer(NativeList<byte> buffer)
+        {
+            this.buffer = buffer;
+        }
+
+        public unsafe void Add(T data)
+        {
+            var oldLength = buffer.Length;
+            buffer.Resize(oldLength + sizeof(T), NativeArrayOptions.UninitializedMemory);
+            UnsafeUtility.CopyStructureToPtr(ref data, (byte*)buffer.GetUnsafePtr() + oldLength);
+        }
+
+        public unsafe T this[int index]
+        {
+            get
+            {
+                if (index < 0 || index >= Length)
+                    throw new IndexOutOfRangeException(nameof(index));
+                var p = (T*)buffer.GetUnsafeReadOnlyPtr();
+                return p[index];
+            }
+        }
+    }
+
+    public static class TypedBufferExtensions
+    {
+        public static TypedBuffer<T> ToTypedBuffer<T>(this NativeList<byte> buffer)
+            where T : unmanaged
+            => new(buffer);
+
+        public static unsafe void Sort<T>(this TypedBuffer<T> typedBuffer)
+            where T : unmanaged, IComparable<T>
+        {
+            var p = (T*)typedBuffer.buffer.GetUnsafePtr();
+            var l = typedBuffer.buffer.Length / sizeof(T);
+            NativeSortExtension.Sort(p, l);
+        }
+    }
+}
\ No newline at end of file
diff --git a/LocalPackages/com.nimin.lowlevel/Runtime/TypedBuffer.cs.meta b/LocalPackages/com.nimin.lowlevel/Runtime/TypedBuffer.cs.meta
new file mode 100644
index 0000000..2641b98
--- /dev/null
+++ b/LocalPackages/com.nimin.lowlevel/Runtime/TypedBuffer.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: edfdc737cb64451ebdd0dc178e8c07af
+timeCreated: 1767469202
\ No newline at end of file
diff --git a/LocalPackages/com.nimin.network/Runtime/ClientAgent.cs b/LocalPackages/com.nimin.network/Runtime/ClientAgent.cs
index a3aa415..2c3c348 100644
--- a/LocalPackages/com.nimin.network/Runtime/ClientAgent.cs
+++ b/LocalPackages/com.nimin.network/Runtime/ClientAgent.cs
@@ -5,16 +5,87 @@ namespace GameCore.Network
 {
     public struct ClientAgent : IDisposable
     {
-        private NativeList<int> dirtySet;
-        
+        private struct Entry
+        {
+            public int srcIndex;
+            public int generation;
+            public int confirmedFrameId;
+            public int deleteFrameId;
+            public bool inView;
+        }
+
+        private NativeList<Entry> entryList;
+        private NativeHashMap<int, int> entryIndexMap;
+        private NativeList<int> dirtyList;
+        private NativeList<byte> tempBuffer;
+
+        public ClientAgent(AllocatorManager.AllocatorHandle allocator)
+        {
+            entryList = new NativeList<Entry>(allocator) { default };
+            entryIndexMap = new NativeHashMap<int, int>(16, allocator);
+
+            dirtyList = new NativeList<int>(allocator);
+            tempBuffer  = new NativeList<byte>(allocator);
+        }
+
         public void Dispose()
         {
-            //TODO
+            entryList.Dispose();
+            entryIndexMap.Dispose();
+            dirtyList.Dispose();
+            tempBuffer.Dispose();
         }
 
         public void UpdateDirtySet(NetDatabase.Snapshot netDatabase, int frameId)
         {
+            // clear inView flag
+            for (int i = 1, l = entryList.Length; i < l; ++i)
+            {
+                entryList.ElementAt(i).inView = false;
+            }
+
+            var tempIntList = dirtyList;
+            tempIntList.Clear();
+
+            // 收集旧视野中的东西，包括等待删除的 entity
+            for (int i = 1, l = entryList.Length; i < l; ++i)
+            {
+                ref readonly var entry = ref entryList.ElementAt(i);
+
+                if (entry.srcIndex == 0)
+                {
+                    //TODO
+                }
+                else
+                {
+                    tempIntList.Add(i);
+                }
+            }
+
+            var oldInViewCount = tempIntList.Length;
             
+            netDatabase.GatherNetDataIndex(tempIntList);
+            
+            // 遍历 tempIntList 中新视野部分 （oldInViewCount 之后）
+            {
+                var j = oldInViewCount;
+                for (int i = oldInViewCount, l = tempIntList.Length; i < l; ++i)
+                {
+                    var srcIndex = tempIntList[i];
+                    if (entryIndexMap.TryGetValue(srcIndex, out var index))
+                    {
+                        entryList.ElementAt(index).inView = true;
+                    }
+                    else
+                    {
+                        tempIntList[j++] = srcIndex;
+                    }
+                }
+                tempIntList.Resize(j, NativeArrayOptions.UninitializedMemory);
+            }
+
+            //TODO
+
         }
     }
 }
\ No newline at end of file