diff --git a/mindspore/dataset/engine/samplers.py b/mindspore/dataset/engine/samplers.py
index cee38dfa35c9b18c887a0344a3f23fd77b64264f..56ef705f608b0fe2f70a1754c24f3713c999e130 100644
--- a/mindspore/dataset/engine/samplers.py
+++ b/mindspore/dataset/engine/samplers.py
@@ -506,6 +506,9 @@ class SubsetRandomSampler(BuiltinSampler):
 
     def get_num_samples(self):
         num_samples = super().get_num_samples()
+        if num_samples is None:
+            return len(self.indices)
+
         return min(len(self.indices), num_samples)