Thanks ptrblck, that’s a good guide.
But I did try still fail.
I want to able to access these fields after load traced file.
My test environment is at Windows pytorch 1.1.0
import torch
import torchvision
m = torchvision.models.resnet18()
t_m = torch.jit.trace(m, torch.rand(1, 3, 224, 224))
m._modules['conv1'].stride
#(2, 2)
t_m._modules['conv1']
#TracedModule[Conv2d]()
t_m._modules['conv1'].stride
---------------------------------------------------------------------------
# AttributeError                            Traceback (most recent call last)
# <ipython-input-26-22862c1bf06c> in <module>()
# ----> 1 t_m._modules['conv1'].stride

# c:\program files\python35\lib\site-packages\torch\jit\__init__.py in __getattr__(self, attr)
   # 1230             if self._c._has_attribute(attr):
   # 1231                 return self._c._get_attribute(attr)
# -> 1232             return Module.__getattr__(self, attr)
   # 1233 
   # 1234         def __setattr__(self, attr, value):

# c:\program files\python35\lib\site-packages\torch\nn\modules\module.py in __getattr__(self, name)
    # 537                 return modules[name]
    # 538         raise AttributeError("'{}' object has no attribute '{}'".format(
# --> 539             type(self).__name__, name))
    # 540 
    # 541     def __setattr__(self, name, value):

# AttributeError: 'TracedModule' object has no attribute 'stride'

torch.jit.save(t_m, 'traced_resnet18.pt')
reload_t_m = torch.jit.load('traced_resnet18.pt')
reload_t_m._modules['conv1']
#ScriptModule()
reload_t_m._modules['conv1'].stride
---------------------------------------------------------------------------
# AttributeError                            Traceback (most recent call last)
# <ipython-input-31-eae0d5d2cc24> in <module>()
# ----> 1 reload_t_m._modules['conv1'].stride

# c:\program files\python35\lib\site-packages\torch\jit\__init__.py in __getattr__(self, attr)
   # 1230             if self._c._has_attribute(attr):
   # 1231                 return self._c._get_attribute(attr)
# -> 1232             return Module.__getattr__(self, attr)
   # 1233 
   # 1234         def __setattr__(self, attr, value):

# c:\program files\python35\lib\site-packages\torch\nn\modules\module.py in __getattr__(self, name)
    # 537                 return modules[name]
    # 538         raise AttributeError("'{}' object has no attribute '{}'".format(
# --> 539             type(self).__name__, name))
    # 540 
    # 541     def __setattr__(self, name, value):

# AttributeError: 'ScriptModule' object has no attribute 'stride'