diff --git a/StgSharp.Common/Collections/CapacityFixedBag.cs b/StgSharp.Common/Collections/CapacityFixedBag.cs
index 69c48c28..bb1fbd5a 100644
--- a/StgSharp.Common/Collections/CapacityFixedBag.cs
+++ b/StgSharp.Common/Collections/CapacityFixedBag.cs
@@ -28,6 +28,7 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Reflection;
 
 namespace StgSharp.Collections
 {
@@ -72,6 +73,16 @@ namespace StgSharp.Collections
             }
         }
 
+        public void RemoveAt(int index)
+        {
+            if (index >= 0)
+            {
+                _buffer[index] = _buffer[Count - 1];
+                _buffer[Count - 1] = default!;
+                Count--;
+            }
+        }
+
         IEnumerator IEnumerable.GetEnumerator()
         {
             return GetEnumerator();
diff --git a/StgSharp.Mathematics/Numeric/MatrixParallel.Publish.cs b/StgSharp.Mathematics/Numeric/MatrixParallel.Publish.cs
index f97c01b0..d7216bb4 100644
--- a/StgSharp.Mathematics/Numeric/MatrixParallel.Publish.cs
+++ b/StgSharp.Mathematics/Numeric/MatrixParallel.Publish.cs
@@ -820,27 +820,27 @@ namespace StgSharp.Mathematics.Numeric
             int tileWidth = (1024 / secCount) + 1;
             int tileCount = (primCount / tileWidth) + 1;
 
-            CapacityFixedStack<MatrixParallelWrap> wraps = LeadParallel();
+            MatrixParallelPool pool = LeadParallel();
 
-            int tilePerThreadLess = tileCount / wraps.Count;
-            int tileToSlice = tileCount % wraps.Count;
-            int slicingPerWrap = tileToSlice / wraps.Count;
-            int extraTiles = tileToSlice % wraps.Count;
+            int tilePerThreadLess = tileCount / pool.SpareThreadCount;
+            int tileToSlice = tileCount % pool.SpareThreadCount;
+            int slicingPerWrap = tileToSlice / pool.SpareThreadCount;
+            int extraTiles = tileToSlice % pool.SpareThreadCount;
 
             int total = tileCount;
             int begin = 0;
-            Stack<MatrixParallelWrap> taskBunch = new Stack<MatrixParallelWrap>(wraps.Count);
+            Stack<MatrixParallelWrap> taskBunch = new Stack<MatrixParallelWrap>(pool.SpareThreadCount);
             while (tileCount > 0)
             {
-                MatrixParallelWrap wrap = wraps.Pop();
+                _ = pool.TryRequestWrap(out MatrixParallelWrap? wrap);
                 bool hasSlice = tileToSlice > 0;
                 bool isLargeSlice = extraTiles > 0;
 
                 // count tiles for wrap
                 // TODO 此处应该是线程数量而不是线程束数量
                 // TODO 需要想办法正确同步线程数量信息
-                int toSlice = hasSlice ? wrap.WrapTaskCapacity * slicingPerWrap : 0;
-                int baseTile = wrap.WrapTaskCapacity * tilePerThreadLess;
+                int toSlice = hasSlice ? wrap!.WrapTaskCapacity * slicingPerWrap : 0;
+                int baseTile = wrap!.WrapTaskCapacity * tilePerThreadLess;
                 int tileInWrap = baseTile + toSlice + (isLargeSlice ? 1 : 0);
                 int columnInWrap = tileInWrap * tileWidth;
 
@@ -857,7 +857,7 @@ namespace StgSharp.Mathematics.Numeric
                 begin += tileInWrap;
                 taskBunch.Push(wrap);
             }
-            ReleaseParallelLeadership(ref wraps);
+            ReleaseParallelLeadership(ref pool);
 
             return taskBunch;
         }
diff --git a/StgSharp.Mathematics/Numeric/MatrixParallelPool.cs b/StgSharp.Mathematics/Numeric/MatrixParallelPool.cs
index a2309f31..e464cf82 100644
--- a/StgSharp.Mathematics/Numeric/MatrixParallelPool.cs
+++ b/StgSharp.Mathematics/Numeric/MatrixParallelPool.cs
@@ -28,6 +28,7 @@
 using StgSharp.Collections;
 using System;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
@@ -46,34 +47,63 @@ namespace StgSharp.Mathematics.Numeric
         {
             SpareWrap = CapacityFixedStackBuilder.Create(wrapSpan);
             SingleThreadAllocation = new CapacityFixedBag<MatrixParallelWrap>(wrapSpan.Length);
-            SpareThreads = threadCount;
+            SpareThreadCount = threadCount;
         }
 
         internal MatrixParallelPool(int threadCount, CapacityFixedStack<MatrixParallelWrap> wrapSpan)
         {
             SpareWrap = wrapSpan;
             SingleThreadAllocation = new CapacityFixedBag<MatrixParallelWrap>(wrapSpan.Count);
-            SpareThreads = threadCount;
+            SpareThreadCount = threadCount;
         }
 
-        public int SpareThreads { get; set; }
+        public int SpareThreadCount { get; set; }
 
         internal CapacityFixedBag<MatrixParallelWrap> SingleThreadAllocation { get; set; }
 
         internal CapacityFixedStack<MatrixParallelWrap> SpareWrap { get; set; }
 
-        public bool TryRequestLeaderHandle(out MatrixParallelWrap.Handle handle) { }
+        public void ReturnIndividualHandle(ref MatrixParallelWrap.Handle handle)
+        {
+            MatrixParallelWrap wrap = handle.Wrap;
+            handle.Role = 0;
+            if (wrap.IsAllAvailable)
+            {
+                SingleThreadAllocation.RemoveAt(wrap.Magic);
+                SpareWrap.Push(wrap);
+                SpareThreadCount += wrap.WrapTaskCapacity;
+            }
+        }
 
-        public bool TryRequestWrap(out MatrixParallelWrap? wrap)
+        public bool TryRentIndividualHandle(out MatrixParallelWrap.Handle handle)
+        {
+            foreach (MatrixParallelWrap item in SingleThreadAllocation)
+            {
+                if (item.TryGetLeaderHandle(out handle!)) {
+                    return true;
+                }
+            }
+            if (TryRequestWrap(out MatrixParallelWrap wrap))
+            {
+                wrap!.Magic = SingleThreadAllocation.Count;
+                SingleThreadAllocation.Add(wrap);
+                if (wrap.TryGetLeaderHandle(out handle!)) {
+                    return true;
+                }
+            }
+            handle = null!;
+            return false;
+        }
+
+        public bool TryRequestWrap([NotNull]out MatrixParallelWrap? wrap)
         {
             if (SpareWrap.TryPop(out wrap))
             {
-                SpareThreads -= wrap.WrapTaskCapacity;
+                SpareThreadCount -= wrap.WrapTaskCapacity;
                 return true;
-            } else
-            {
-                return false;
             }
+            wrap = null!;
+            return false;
         }
 
     }
diff --git a/StgSharp.Mathematics/Numeric/MatrixParallelWrap.cs b/StgSharp.Mathematics/Numeric/MatrixParallelWrap.cs
index 668f5dde..bcf37e8b 100644
--- a/StgSharp.Mathematics/Numeric/MatrixParallelWrap.cs
+++ b/StgSharp.Mathematics/Numeric/MatrixParallelWrap.cs
@@ -45,6 +45,7 @@ namespace StgSharp.Mathematics.Numeric
         {
             ID = id;
             _threads = new Thread[wrapSize];
+            _resetHandle = new Handle[wrapSize];
             for (int i = 0; i < wrapSize; i++)
             {
                 _threads[i] = new Thread(MatrixParallelWorker)
@@ -53,7 +54,23 @@ namespace StgSharp.Mathematics.Numeric
                     Priority = ThreadPriority.BelowNormal,
                     Name = $"MPT#{ID}_{i}"
                 };
-                _threads[i].Start(new Handle(i, this));
+                Handle handle = new Handle(i, this);
+                _resetHandle[i] = handle;
+                _threads[i].Start(handle);
+            }
+        }
+
+        public bool IsAllAvailable
+        {
+            get
+            {
+                foreach (Handle item in _resetHandle)
+                {
+                    if (item.Role != 0) {
+                        return false;
+                    }
+                }
+                return true;
             }
         }
 
@@ -75,6 +92,21 @@ namespace StgSharp.Mathematics.Numeric
             }
         }
 
+        internal bool TryGetLeaderHandle(out Handle? handle)
+        {
+            foreach (Handle item in _resetHandle)
+            {
+                if (item.Role != 2)
+                {
+                    handle = item;
+                    item.Role = 2;
+                    return true;
+                }
+            }
+            handle = null;
+            return false;
+        }
+
         public class Handle(int inWrapIndex, MatrixParallelWrap wrap)
         {