diff --git a/fastNLP/core/samplers/reproducible_batch_sampler.py b/fastNLP/core/samplers/reproducible_batch_sampler.py
index 874ad895..edb8a67f 100644
--- a/fastNLP/core/samplers/reproducible_batch_sampler.py
+++ b/fastNLP/core/samplers/reproducible_batch_sampler.py
@@ -318,7 +318,15 @@ class RandomBatchSampler(ReproducibleBatchSampler):
 
     @property
     def num_samples(self):
-        return getattr(self.dataset, 'total_len', len(self.dataset))
+        """
+        返回样本的总数
+
+        :return:
+        """
+        total_len = getattr(self.dataset, 'total_len', None)
+        if not isinstance(total_len, int):
+            total_len = len(self.dataset)
+        return total_len
 
     def __len__(self)->int:
         """
@@ -473,7 +481,15 @@ class BucketedBatchSampler(ReproducibleBatchSampler):
 
     @property
     def num_samples(self):
-        return getattr(self.dataset, 'total_len', len(self.dataset))
+        """
+        返回样本的总数
+
+        :return:
+        """
+        total_len = getattr(self.dataset, 'total_len', None)
+        if not isinstance(total_len, int):
+            total_len = len(self.dataset)
+        return total_len
 
     def __len__(self)->int:
         """
diff --git a/fastNLP/core/samplers/reproducible_sampler.py b/fastNLP/core/samplers/reproducible_sampler.py
index a1dc318e..fe38a808 100644
--- a/fastNLP/core/samplers/reproducible_sampler.py
+++ b/fastNLP/core/samplers/reproducible_sampler.py
@@ -222,7 +222,10 @@ class RandomSampler(ReproducibleSampler):
 
         :return:
         """
-        return getattr(self.dataset, 'total_len', len(self.dataset))
+        total_len = getattr(self.dataset, 'total_len', None)
+        if not isinstance(total_len, int):
+            total_len = len(self.dataset)
+        return total_len
 
 class SequentialSampler(RandomSampler):
     """