diff --git a/padiff/abstracts/hooks/guard.py b/padiff/abstracts/hooks/guard.py
index 18426b5..f97c230 100644
--- a/padiff/abstracts/hooks/guard.py
+++ b/padiff/abstracts/hooks/guard.py
@@ -284,6 +284,8 @@ def PaDiffGuard(
         # dump
         proxy_model.dump_report(proxy_model.dump_path)
         proxy_model.dump_weights(proxy_model.dump_path)
+        if optimizer is None:
+            proxy_model.dump_grads(proxy_model.dump_path)
 
         sys.exit(0)
 
diff --git a/padiff/abstracts/hooks/hook.py b/padiff/abstracts/hooks/hook.py
index 7ec297d..1b7af6c 100644
--- a/padiff/abstracts/hooks/hook.py
+++ b/padiff/abstracts/hooks/hook.py
@@ -28,6 +28,7 @@
     logger,
     map_structure,
     get_numpy_from_tensor,
+    is_require_grad,
 )
 from .base import current_report, find_base_report_node, single_step_state
 
@@ -46,16 +47,19 @@ def register_hooker(model):
     handle_init = model.register_forward_pre_hook(partial(init_weights_hook))
     remove_handles.append(handle_init)
 
+    param_handles = creat_param_handles(model)
+    remove_handles.extend(param_handles)
+
     # register layer-level hooks
     for mod in models:
         pre_handle = mod.register_forward_pre_hook(partial(pre_structure_hook))
         if mod.model not in marker.black_list:
-            logger.debug(f"Register(info_hook): {mod.model.__class__.__name__}(net_id={idx})")
+            logger.debug(f"Register(info_hook): {mod.class_name}(net_id={idx})")
             handle = mod.register_forward_post_hook(partial(info_hook, net_id=idx))
             remove_handles.append(handle)
             idx += 1
         else:
-            logger.debug(f"Skip(info_hook): {mod.model.__class__.__name__}(blacklisted)")
+            logger.debug(f"Skip(info_hook): {mod.class_name}(blacklisted)")
         post_handle = mod.register_forward_post_hook(partial(post_structure_hook))
         remove_handles.extend([pre_handle, post_handle])
     yield
@@ -228,6 +232,26 @@ def tensor_hook(x_grad, bwd_item, nth_tensor, net_id):
     return x_grad
 
 
+def creat_param_handles(model):
+    handles = []
+
+    for name, proxy_param in model.named_parameters(recursively=True):
+        if is_require_grad(proxy_param.param):
+
+            def make_hook(param, param_name):
+                def hook(grad):
+                    logger.debug(f"Grad hook triggered for {param_name}")
+                    param._collected_grad = grad
+                    return grad
+
+                return hook
+
+            handle = proxy_param.param.register_hook(make_hook(proxy_param.param, name))
+            handles.append(handle)
+
+    return handles
+
+
 """
     utils
 """
diff --git a/padiff/abstracts/report.py b/padiff/abstracts/report.py
index 33627ad..eab6440 100644
--- a/padiff/abstracts/report.py
+++ b/padiff/abstracts/report.py
@@ -14,7 +14,7 @@
 
 import os
 
-from ..utils import Counter, for_each_grad_tensor, for_each_tensor
+from ..utils import Counter, for_each_grad_tensor, for_each_tensor, for_each_grad_tensor_no_require
 
 
 class LayerStack:
@@ -188,7 +188,7 @@ def tensors_for_compare(self):
         if self.type == "forward":
             return [t for (t,) in for_each_tensor(self.output)]
         if self.type == "backward":
-            return [t for (t,) in for_each_grad_tensor(self.input_grads)]
+            return [t for (t,) in for_each_grad_tensor_no_require(self.input_grads)]
 
     def __repr__(self):
         return self.__str__()
diff --git a/padiff/cli.py b/padiff/cli.py
index 000a889..c2baeb0 100644
--- a/padiff/cli.py
+++ b/padiff/cli.py
@@ -124,6 +124,7 @@ def main():
            这些参数指定您在脚本中创建优化器实例的**变量名**。
            * 它们不是类名，也不是文件名。
            * 它们是优化器实例化时 `=` 左边的标识符。
+           * 默认值: None (不传递优化器)
 
            示例：
               如果您的 PyTorch 脚本中有：
diff --git a/padiff/tools/dump.py b/padiff/tools/dump.py
index c5e9b3b..92dd2ca 100644
--- a/padiff/tools/dump.py
+++ b/padiff/tools/dump.py
@@ -194,14 +194,14 @@ def dump_grads(model, path):
     grad_dumper = numpy_dumper(path + "/grads", "grads")
 
     def _dump(param_name, param, param_info):
-        if param.main_grad() is not None:
-            file_name = grad_dumper(param.main_grad())
-            param_info["grads"][param_name] = file_name
-        elif param.grad() is not None:
-            file_name = grad_dumper(param.grad())
-            param_info["grads"][param_name] = file_name
-        else:
-            param_info["grads"][param_name] = None
+        grad = param.main_grad()
+        if grad is None:
+            grad = param.grad()
+        if grad is None and hasattr(param.param, "_collected_grad"):
+            grad = param.param._collected_grad
+            grad = get_numpy_from_tensor(grad) if grad is not None else None
+
+        param_info["grads"][param_name] = grad_dumper(grad) if grad is not None else None
 
     dump_param_prototype(model, _dump, f"{path}/grads.json")
 
diff --git a/padiff/utils/utils.py b/padiff/utils/utils.py
index fee8541..40ef696 100644
--- a/padiff/utils/utils.py
+++ b/padiff/utils/utils.py
@@ -228,6 +228,12 @@ def filter_fn(ts):
         yield ts
 
 
+def for_each_grad_tensor_no_require(*structure):
+    for ts in for_each_tensor(*structure):
+        if is_tensors(*ts):
+            yield ts
+
+
 def map_structure_and_replace_key(func, structure1, structure2):
     """
     Apply `func` to each entry in `structure` and return a new structure.