diff --git a/finetune_speaker_v2.py b/finetune_speaker_v2.py
index a0709d4..75baf7e 100644
--- a/finetune_speaker_v2.py
+++ b/finetune_speaker_v2.py
@@ -100,18 +100,26 @@ def run(rank, n_gpus, hps):
   # load existing model
   if hps.cont:
       try:
-          _, _, _, epoch_str = utils.load_checkpoint("./OUTPUT_MODEL/G_latest.pth", net_g, None)
-          _, _, _, epoch_str = utils.load_checkpoint("./OUTPUT_MODEL/D_latest.pth", net_d, None)
-          global_step = epoch_str * hps.train.batch_size
+          _, _, _, epoch_str = utils.load_checkpoint(utils.latest_checkpoint_path(hps.model_dir, "G_[0-9]*.pth"), net_g, None)
+          _, _, _, epoch_str = utils.load_checkpoint(utils.latest_checkpoint_path(hps.model_dir, "D_[0-9]*.pth"), net_d, None)
+          global_step = (epoch_str - 1) * len(train_loader)
       except:
           print("Failed to find latest checkpoint, loading G_0.pth...")
-          _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/G_0.pth", net_g, None)
-          _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/D_0.pth", net_d, None)
+          if hps.train_with_pretrained_model:
+              print("Train with pretrained model...")
+              _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/G_0.pth", net_g, None)
+              _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/D_0.pth", net_d, None)
+          else:
+              print("Train without pretrained model...")
           epoch_str = 1
           global_step = 0
   else:
-      _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/G_0.pth", net_g, None)
-      _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/D_0.pth", net_d, None)
+      if hps.train_with_pretrained_model:
+          print("Train with pretrained model...")
+          _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/G_0.pth", net_g, None)
+          _, _, _, epoch_str = utils.load_checkpoint("./pretrained_models/D_0.pth", net_d, None)
+      else:
+          print("Train without pretrained model...")
       epoch_str = 1
       global_step = 0
   # freeze all other layers except speaker embedding
@@ -256,13 +264,16 @@ def train_and_evaluate(rank, epoch, hps, nets, optims, schedulers, scaler, loade
         utils.save_checkpoint(net_g, None, hps.train.learning_rate, epoch,
                               os.path.join(hps.model_dir, "G_latest.pth".format(global_step)))
         utils.save_checkpoint(net_d, None, hps.train.learning_rate, epoch, os.path.join(hps.model_dir, "D_{}.pth".format(global_step)))
-        utils.save_checkpoint(net_d, None, hps.train.learning_rate, epoch,
-                              os.path.join(hps.model_dir, "D_latest.pth".format(global_step)))
-        old_g=os.path.join(hps.model_dir, "G_{}.pth".format(global_step-4000))
-        old_d=os.path.join(hps.model_dir, "D_{}.pth".format(global_step-4000))
+        # utils.save_checkpoint(net_d, None, hps.train.learning_rate, epoch,
+        #                       os.path.join(hps.model_dir, "D_latest.pth".format(global_step)))
+        old_g = utils.oldest_checkpoint_path(hps.model_dir, "G_[0-9]*.pth",
+                                             preserved=hps.preserved)  # Preserve 4 (default) historical checkpoints.
+        old_d = utils.oldest_checkpoint_path(hps.model_dir, "D_[0-9]*.pth", preserved=hps.preserved)
         if os.path.exists(old_g):
+          print(f"remove {old_g}")
           os.remove(old_g)
         if os.path.exists(old_d):
+          print(f"remove {old_d}")
           os.remove(old_d)
     global_step += 1
     if epoch > hps.max_epochs:
diff --git a/utils.py b/utils.py
index 51e3dee..205d929 100644
--- a/utils.py
+++ b/utils.py
@@ -204,14 +204,29 @@ def summarize(writer, global_step, scalars={}, histograms={}, images={}, audios=
         writer.add_audio(k, v, global_step, audio_sampling_rate)
 
 
-def latest_checkpoint_path(dir_path, regex="G_*.pth"):
+def extract_digits(f):
+    digits = "".join(filter(str.isdigit, f))
+    return int(digits) if digits else -1
+
+
+def latest_checkpoint_path(dir_path, regex="G_[0-9]*.pth"):
     f_list = glob.glob(os.path.join(dir_path, regex))
-    f_list.sort(key=lambda f: int("".join(filter(str.isdigit, f))))
+    f_list.sort(key=lambda f: extract_digits(f))
     x = f_list[-1]
-    print(x)
+    print(f"latest_checkpoint_path:{x}")
     return x
 
 
+def oldest_checkpoint_path(dir_path, regex="G_[0-9]*.pth", preserved=4):
+    f_list = glob.glob(os.path.join(dir_path, regex))
+    f_list.sort(key=lambda f: extract_digits(f))
+    if len(f_list) > preserved:
+        x = f_list[0]
+        print(f"oldest_checkpoint_path:{x}")
+        return x
+    return ""
+
+
 def plot_spectrogram_to_numpy(spectrogram):
     global MATPLOTLIB_FLAG
     if not MATPLOTLIB_FLAG:
@@ -288,6 +303,10 @@ def get_hparams(init=True):
                         help='finetune epochs')
     parser.add_argument('--cont', type=bool, default=False, help='whether to continue training on the latest checkpoint')
     parser.add_argument('--drop_speaker_embed', type=bool, default=False, help='whether to drop existing characters')
+    parser.add_argument('--train_with_pretrained_model', type=bool, default=True,
+                        help='whether to train with pretrained model')
+    parser.add_argument('--preserved', type=int, default=4,
+                        help='Number of preserved models')
 
     args = parser.parse_args()
     model_dir = os.path.join("./", args.model)
@@ -312,6 +331,8 @@ def get_hparams(init=True):
     hparams.max_epochs = args.max_epochs
     hparams.cont = args.cont
     hparams.drop_speaker_embed = args.drop_speaker_embed
+    hparams.train_with_pretrained_model = args.train_with_pretrained_model
+    hparams.preserved = args.preserved
     return hparams