diff --git a/tools/analyze_logs.py b/tools/analyze_logs.py
index c3a468b55..fb017efaa 100644
--- a/tools/analyze_logs.py
+++ b/tools/analyze_logs.py
@@ -30,6 +30,9 @@ def plot_curve(log_dicts, args):
             plot_epochs = []
             plot_iters = []
             plot_values = []
+            # In some log files, iters number is not correct, `pre_iter` is
+            # used to prevent generate wrong lines.
+            pre_iter = -1
             for epoch in epochs:
                 epoch_logs = log_dict[epoch]
                 if metric not in epoch_logs.keys():
@@ -39,6 +42,9 @@ def plot_curve(log_dicts, args):
                     plot_values.append(epoch_logs[metric][0])
                 else:
                     for idx in range(len(epoch_logs[metric])):
+                        if pre_iter > epoch_logs['iter'][idx]:
+                            continue
+                        pre_iter = epoch_logs['iter'][idx]
                         plot_iters.append(epoch_logs['iter'][idx])
                         plot_values.append(epoch_logs[metric][idx])
             ax = plt.gca()