diff --git a/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.AutoFreezeBlendShape.cs b/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.AutoFreezeBlendShape.cs
new file mode 100644
index 000000000..30bd1ca7a
--- /dev/null
+++ b/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.AutoFreezeBlendShape.cs
@@ -0,0 +1,39 @@
+using System.Linq;
+using UnityEditor;
+using UnityEngine;
+
+namespace Anatawa12.AvatarOptimizer.Processors
+{
+    partial class AutomaticConfigurationProcessor
+    {
+        private void AutoFreezeBlendShape()
+        {
+            foreach (var skinnedMeshRenderer in _session.GetComponents<SkinnedMeshRenderer>())
+            {
+                var mesh = skinnedMeshRenderer.sharedMesh;
+
+                // skip SMR without mesh
+                if (!mesh) continue;
+                // skip configured mesh
+                if (skinnedMeshRenderer.GetComponent<FreezeBlendShape>()) continue;
+
+                var modifies = GetModifiedProperties(skinnedMeshRenderer);
+                var notChanged = Enumerable.Range(0, mesh.blendShapeCount)
+                    .Select(i => mesh.GetBlendShapeName(i))
+                    .Where(name => !modifies.Contains($"blendShape.{name}"))
+                    .ToArray();
+
+                if (notChanged.Length == 0) continue;
+
+                var freeze = skinnedMeshRenderer.gameObject.AddComponent<FreezeBlendShape>();
+                var serialized = new SerializedObject(freeze);
+                var editorUtil = PrefabSafeSet.EditorUtil<string>.Create(
+                    serialized.FindProperty(nameof(FreezeBlendShape.shapeKeysSet)),
+                    0, p => p.stringValue, (p, v) => p.stringValue = v);
+                foreach (var shape in notChanged)
+                    editorUtil.GetElementOf(shape).EnsureAdded();
+                serialized.ApplyModifiedPropertiesWithoutUndo();
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.AutoFreezeBlendShape.cs.meta b/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.AutoFreezeBlendShape.cs.meta
new file mode 100644
index 000000000..f8237b03d
--- /dev/null
+++ b/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.AutoFreezeBlendShape.cs.meta
@@ -0,0 +1,3 @@
+fileFormatVersion: 2
+guid: 856c21da5d1f4eb29a5c3593c2825ba9
+timeCreated: 1689553831
\ No newline at end of file
diff --git a/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.cs b/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.cs
index b24f1b3be..1f9b339e3 100644
--- a/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.cs
+++ b/Editor/Processors/AutomaticConfiguration/AutomaticConfigurationProcessor.cs
@@ -20,6 +20,7 @@ public void Process(OptimizerSession session)
 
             // TODO: implement
             GatherAnimationModifications();
+            AutoFreezeBlendShape();
         }
 
         private IReadOnlyCollection<string> GetModifiedProperties(Component component)