diff --git a/.gitignore b/.gitignore
index 783241d..e789812 100644
--- a/.gitignore
+++ b/.gitignore
@@ -57,3 +57,4 @@ t.sh
 
 unittest/outputs/
 unittest/tmp/
+**/tmp/
diff --git a/README.md b/README.md
index 60b0789..31c85ae 100644
--- a/README.md
+++ b/README.md
@@ -83,16 +83,81 @@ pip install -r requirements.txt && python setup.py develop
 ```
 
 ## Must Try
+The follow codes and comments walk you through the key functionality of OpenDelta.
 
 ```python
-from transformers import AutoModelForSeq2SeqLM
+# use tranformers as usual.
+from transformers import AutoModelForSeq2SeqLM, AutoTokenizer
 t5 = AutoModelForSeq2SeqLM.from_pretrained("t5-large")
-from opendelta import AutoDeltaModel
-delta = AutoDeltaModel.from_finetuned("thunlp/FactQA_T5-large_Adapter", backbone_model=t5)
+t5_tokenizer = AutoTokenizer.from_pretrained("t5-large")
+inputs_ids = t5_tokenizer.encode("Is Harry Poter wrtten by JKrowling", return_tensors="pt")
+t5_tokenizer.decode(t5.generate(inputs_ids)[0]) 
+# >>> '<pad><extra_id_0>? Is it Harry Potter?</s>'
+
+
+# use existing delta models
+from opendelta import AutoDeltaModel, AutoDeltaConfig
+# use existing delta models from DeltaCenter
+delta = AutoDeltaModel.from_finetuned("thunlp/Spelling_Correction_T5_LRAdapter_demo", backbone_model=t5)
+# freeze the backbone model except the delta models.
+delta.freeze_module()
+# see the change
 delta.log()
+
+
+t5_tokenizer.decode(t5.generate(inputs_ids)[0]) 
+# >>> <pad> Is Harry Potter written by JK Rowling?</s>
+
+
+# Now save the delta models, not the whole backbone model to tmp
+delta.save_finetuned(".tmp")
+# >>>  The state dict size is 1.443 MB
+# >>>  We encourage users to push their final and public models to delta center to share them with the community!
+
+
+# reload the model from local url and add it to pre-trained T5.
+t5 = AutoModelForSeq2SeqLM.from_pretrained("t5-large")
+delta1 = AutoDeltaModel.from_finetuned(".tmp", backbone_model=t5)
+import shutil; shutil.rmtree(".tmp") # don't forget to remove the tmp files. 
+t5_tokenizer.decode(t5.generate(inputs_ids)[0]) 
+# >>> <pad> Is Harry Potter written by JK Rowling?</s>
+
+# detach the delta models, the model returns to the unmodified status.
+delta1.detach()
+t5_tokenizer.decode(t5.generate(inputs_ids)[0])  
+# >>> '<pad><extra_id_0>? Is it Harry Potter?</s>'
+
+# use default configuration for cunstomized wrapped models which have PLMs inside.
+import torch.nn as nn
+class WrappedModel(nn.Module):
+  def __init__(self, inner_model):
+    super().__init__()
+    self.inner = inner_model
+  def forward(self, *args, **kwargs):
+    return self.inner(*args, **kwargs)
+
+wrapped_model = WrappedModel(WrappedModel(t5))
+
+# say we use LoRA
+delta_config = AutoDeltaConfig.from_dict({"delta_type":"lora"})
+delta2 = AutoDeltaModel.from_config(delta_config, backbone_model=wrapped_model)
+delta2.log()
+# >>> root
+#       -- inner
+#          -- inner
+#             ...
+#             ... lora_A:[8,1024], lora_B:[1024,8]
+delta2.detach()
+
+# use a not default configuration
+# say we add lora to the last four layer of the decoder of t5, with lora rank=5
+delta_config3 = AutoDeltaConfig.from_dict({"delta_type":"lora", "modified_modules":["[r]decoder.*((20)|(21)|(22)|(23)).*DenseReluDense\.wi"], "lora_r":5})
+delta3 = AutoDeltaModel.from_config(delta_config3, backbone_model=wrapped_model)
+delta3.log()
+
 ```
 
-## Verified Supported Models
+## Verified Default Configurations  
 
 - **You can try to use OpenDelta on *any* backbone models based on PyTorch.**  
 - However, with small chances thatThe interface of the submodules of the backbone model is not supported. Therefore we verified some commonly