diff --git a/src/viztracer/viztracer.py b/src/viztracer/viztracer.py
index e998f60d..e551482b 100644
--- a/src/viztracer/viztracer.py
+++ b/src/viztracer/viztracer.py
@@ -222,10 +222,7 @@ def start(self) -> None:
             self.enable = True
             self.parsed = False
             if self.log_torch:
-                try:
-                    from torch.profiler import profile, supported_activities  # type: ignore
-                except ImportError:
-                    raise ImportError("torch is not installed, please install it to use log_torch")
+                from torch.profiler import profile, supported_activities  # type: ignore
                 self.torch_profile = profile(activities=supported_activities()).__enter__()
             if self.log_print:
                 self.overload_print()