diff --git a/excore/cli/_registry.py b/excore/cli/_registry.py
index 7c458ea..6f317ce 100644
--- a/excore/cli/_registry.py
+++ b/excore/cli/_registry.py
@@ -188,7 +188,8 @@ def auto_register():
     Automatically import all modules in `src_dir` and register all modules, then dump to files.
     """
     if not os.path.exists(_workspace_config_file):
-        logger.warning("Please run `excore init` in your command line first!")
+        logger.critical("Please run `excore init` in your command line first!")
+        sys.exit(0)
     target_dir = osp.abspath(_workspace_cfg["src_dir"])
     module_name = _get_default_module_name(target_dir)
     sys.path.append(os.getcwd())
diff --git a/excore/config/lazy_config.py b/excore/config/lazy_config.py
index 8b97343..8942a20 100644
--- a/excore/config/lazy_config.py
+++ b/excore/config/lazy_config.py
@@ -17,6 +17,7 @@ def __init__(self, config: ConfigDict) -> None:
         self.modules_dict, self.isolated_dict = {}, {}
         self.target_modules = config.target_fields
         config.registered_fields = list(Registry._registry_pool.keys())
+        config.all_fields = set([*config.registered_fields, *config.target_fields])
         self._config = deepcopy(config)
         self.build_config_hooks()
         self._config.parse()
diff --git a/excore/config/parse.py b/excore/config/parse.py
index dfc604c..50cf732 100644
--- a/excore/config/parse.py
+++ b/excore/config/parse.py
@@ -1,4 +1,4 @@
-from typing import Dict, List, Type
+from typing import Dict, List, Set, Type
 
 from .._exceptions import CoreConfigParseError
 from ..engine import Registry, logger
@@ -35,6 +35,7 @@ class ConfigDict(dict):
     target_fields: List
     target_to_registry: Dict[str, str]
     registered_fields: List
+    all_fields: Set[str]
 
     def __new__(cls):
         if not hasattr(cls, "target_fields"):
@@ -138,8 +139,7 @@ def _parse_isolated_obj(self):
                     self._parse_isolated_module(name, ModuleNode)
 
     def _contain_module(self, name):
-        fileds = set([*self.target_fields, *self.registered_fields])
-        for k in fileds:
+        for k in self.all_fields:
             if k not in self:
                 continue
             for node in self[k].values():
@@ -175,23 +175,33 @@ def _parse_single_param(self, ori_name, module_type):
         target_type = _dispatch_module_node[module_type]
         name, attrs, hooks = _parse_param_name(ori_name)
         name = self._get_name(name, ori_name)
+        if name in self.all_fields:
+            raise CoreConfigParseError(
+                f"Conflict name: `{name}`, the class name cannot be same with registry"
+            )
         ori_type = None
         if name in self:
             ori_type = self[name].__class__
             if ori_type == ModuleNode:
-                self[name] = target_type.from_node(self[name])
+                node = target_type.from_node(self[name])
+                self._parse_module(node)
+                self[name] = node
             node = self[name]
         elif self._contain_module(name):
             ori_type = self[self.__base__][name].__class__
             if ori_type == ModuleNode:
-                self[self.__base__][name] = target_type.from_node(self[self.__base__][name])
+                node = target_type.from_node(self[self.__base__][name])
+                base = self.__base__
+                self._parse_module(node)
+                self.__base__ = base
+                self[self.__base__][name] = node
             node = self[self.__base__][name]
         else:
             node = self._parse_implicit_module(name, target_type)
         if ori_type and ori_type not in (ModuleNode, target_type):
             raise CoreConfigParseError(
-                f"Error when parsing params {ori_name}, \
-                  target_type is {target_type}, but got {ori_type}"
+                f"Error when parsing param {ori_name}, "
+                f"target_type is {target_type}, but got {ori_type}"
             )
         name = node.name  # for ModuleWrapper
         if attrs:
@@ -204,7 +214,7 @@ def _parse_single_param(self, ori_name, module_type):
             delattr(self, "__base__")
         return node
 
-    def _parse_modules(self, node: ModuleNode):
+    def _parse_module(self, node: ModuleNode):
         for param_name in list(node.keys()):
             true_name, module_type = _is_special(param_name)
             if not module_type:
@@ -229,9 +239,9 @@ def _parse_inter_modules(self):
             module = self[name]
             if name in self.target_fields and isinstance(module, dict):
                 for m in module.values():
-                    self._parse_modules(m)
+                    self._parse_module(m)
             elif isinstance(module, ModuleNode):
-                self._parse_modules(module)
+                self._parse_module(module)
 
     def __str__(self):
         _dict = {}
diff --git a/tests/configs/launch/test_class.toml b/tests/configs/launch/test_class.toml
new file mode 100644
index 0000000..68291a7
--- /dev/null
+++ b/tests/configs/launch/test_class.toml
@@ -0,0 +1,4 @@
+[Model.TestClass]
+$cls = "VGG"
+
+[Backbone.VGG]
diff --git a/tests/configs/launch/test_conflict_name.toml b/tests/configs/launch/test_conflict_name.toml
new file mode 100644
index 0000000..f1d0da2
--- /dev/null
+++ b/tests/configs/launch/test_conflict_name.toml
@@ -0,0 +1,2 @@
+[Model.TestClass]
+$cls = "Backbone"
diff --git a/tests/configs/launch/test_hidden_error.toml b/tests/configs/launch/test_hidden_error.toml
new file mode 100644
index 0000000..e8f7384
--- /dev/null
+++ b/tests/configs/launch/test_hidden_error.toml
@@ -0,0 +1,7 @@
+[Model.FCN]
+!classifier = "$Head"
+@backbone = "$resnnnet"
+
+[Head.FCNHead]
+in_channels = 512
+channels = 10
diff --git a/tests/configs/launch/test_module.toml b/tests/configs/launch/test_module.toml
new file mode 100644
index 0000000..c005f43
--- /dev/null
+++ b/tests/configs/launch/test_module.toml
@@ -0,0 +1,2 @@
+[Model.TestClass]
+$cls = "torch.nn.ReLU"
diff --git a/tests/configs/launch/test_nest.toml b/tests/configs/launch/test_nest.toml
new file mode 100644
index 0000000..8b76ea8
--- /dev/null
+++ b/tests/configs/launch/test_nest.toml
@@ -0,0 +1,12 @@
+[Model.FCN]
+!classifier = "$Head"
+@backbone = "$Backbone"
+
+[Backbone.MockModel]
+!block = "TestBlock"
+
+[Block.TestBlock]
+
+[Head.FCNHead]
+in_channels = 512
+channels = 10
diff --git a/tests/configs/launch/test_nest_hidden.toml b/tests/configs/launch/test_nest_hidden.toml
new file mode 100644
index 0000000..2b4858b
--- /dev/null
+++ b/tests/configs/launch/test_nest_hidden.toml
@@ -0,0 +1,11 @@
+[Model.FCN]
+!classifier = "$Head"
+@backbone = "$Backbone"
+
+[Backbone.MockModel]
+!block = "TestBlock"
+
+
+[Head.FCNHead]
+in_channels = 512
+channels = 10
diff --git a/tests/configs/launch/test_ref_field_error.toml b/tests/configs/launch/test_ref_field_error.toml
new file mode 100644
index 0000000..c142bfd
--- /dev/null
+++ b/tests/configs/launch/test_ref_field_error.toml
@@ -0,0 +1,7 @@
+[Model.FCN]
+!classifier = "$Headdd"
+@backbone = "$resnet18"
+
+[Head.FCNHead]
+in_channels = 512
+channels = 10
diff --git a/tests/configs/launch/test_regitered_error.toml b/tests/configs/launch/test_regitered_error.toml
new file mode 100644
index 0000000..2be40b3
--- /dev/null
+++ b/tests/configs/launch/test_regitered_error.toml
@@ -0,0 +1 @@
+[Model.ResNt]
diff --git a/tests/source_code/__init__.py b/tests/source_code/__init__.py
index 113ef05..0cb1414 100644
--- a/tests/source_code/__init__.py
+++ b/tests/source_code/__init__.py
@@ -1,5 +1,7 @@
 import time
 
+import torch
+
 from excore import Registry
 
 MODEL = Registry("Model")
@@ -15,3 +17,4 @@
 MODULE = Registry("module")
 
 MODULE.register_module(time)
+MODULE.register_module(torch)
diff --git a/tests/source_code/models/nets.py b/tests/source_code/models/nets.py
index e234aef..85fc6ad 100644
--- a/tests/source_code/models/nets.py
+++ b/tests/source_code/models/nets.py
@@ -1,8 +1,10 @@
 from torchvision import models
 from torchvision.models import segmentation
 
+from excore import Registry
 from source_code import BACKBONE, HEAD, MODEL
 
+BLOCK = Registry("Block")
 MODEL.match(segmentation)
 
 
@@ -14,3 +16,20 @@ def _match(name: str, module):
 
 BACKBONE.match(models, force=True, match_func=_match)
 HEAD.register_module(segmentation.fcn.FCNHead)
+
+
+@MODEL.register()
+class TestClass:
+    def __init__(self, cls):
+        self.cls = cls
+
+
+@BACKBONE.register()
+class MockModel:
+    def __init__(self, block):
+        self.block = block
+
+
+@BLOCK.register()
+class TestBlock:
+    pass
diff --git a/tests/test_config.py b/tests/test_config.py
index e3d7806..0685b2a 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -1,6 +1,6 @@
 import pytest
 import torch
-from torchvision.models import ResNet
+from torchvision.models import VGG, ResNet
 
 from excore import config
 from excore._exceptions import CoreConfigParseError, CoreConfigSupportError, ModuleBuildError
@@ -62,3 +62,33 @@ def test_argument_error(self):
     def test_wrong_type(self):
         with pytest.raises(CoreConfigSupportError):
             self._load("./configs/launch/error.yaml")
+
+    def test_class(self):
+        modules, _ = self._load("./configs/launch/test_class.toml", False)
+        assert modules.Model.cls == VGG
+
+    def test_module(self):
+        modules, _ = self._load("./configs/launch/test_module.toml", False)
+        assert modules.Model.cls == torch.nn.ReLU
+
+    def test_regitered_error(self):
+        with pytest.raises(ModuleBuildError):
+            self._load("./configs/launch/test_regitered_error.toml", False)
+
+    def test_hidden_error(self):
+        with pytest.raises(CoreConfigParseError):
+            self._load("./configs/launch/test_hidden_error.toml", False)
+
+    def test_ref_field_error(self):
+        with pytest.raises(CoreConfigParseError):
+            self._load("./configs/launch/test_ref_field_error.toml", False)
+
+    def test_nest(self):
+        self._load("./configs/launch/test_nest.toml", False)
+
+    def test_nest_hidden(self):
+        self._load("./configs/launch/test_nest_hidden.toml", False)
+
+    def test_conflict_name_error(self):
+        with pytest.raises(CoreConfigParseError):
+            self._load("./configs/launch/test_conflict_name.toml", False)