diff --git a/deepmd/entrypoints/test.py b/deepmd/entrypoints/test.py
index 182b5a6eba..e348318f41 100644
--- a/deepmd/entrypoints/test.py
+++ b/deepmd/entrypoints/test.py
@@ -71,7 +71,7 @@ def test(
     set_prefix : str
         string prefix of set
     numb_test : int
-        munber of tests to do
+        munber of tests to do. 0 means all data.
     rand_seed : Optional[int]
         seed for random generator
     shuffle_test : bool
@@ -88,6 +88,9 @@ def test(
     RuntimeError
         if no valid system was found
     """
+    if numb_test == 0:
+        # only float has inf, but should work for min
+        numb_test = float("inf")
     if datafile is not None:
         datalist = open(datafile)
         all_sys = datalist.read().splitlines()
diff --git a/deepmd_cli/main.py b/deepmd_cli/main.py
index f4c28887bd..19cee642cf 100644
--- a/deepmd_cli/main.py
+++ b/deepmd_cli/main.py
@@ -274,7 +274,11 @@ def main_parser() -> argparse.ArgumentParser:
         "-S", "--set-prefix", default="set", type=str, help="The set prefix"
     )
     parser_tst.add_argument(
-        "-n", "--numb-test", default=100, type=int, help="The number of data for test"
+        "-n",
+        "--numb-test",
+        default=0,
+        type=int,
+        help="The number of data for test. 0 means all data.",
     )
     parser_tst.add_argument(
         "-r", "--rand-seed", type=int, default=None, help="The random seed"