diff --git a/data_juicer/config/__init__.py b/data_juicer/config/__init__.py
index 4060b6ac7..ba6deb866 100644
--- a/data_juicer/config/__init__.py
+++ b/data_juicer/config/__init__.py
@@ -1,7 +1,7 @@
-from .config import (export_config, get_init_configs, init_configs,
-                     merge_config, prepare_side_configs)
+from .config import (export_config, get_default_cfg, get_init_configs,
+                     init_configs, merge_config, prepare_side_configs)
 
 __all__ = [
     'init_configs', 'get_init_configs', 'export_config', 'merge_config',
-    'prepare_side_configs'
+    'prepare_side_configs', 'get_default_cfg'
 ]
diff --git a/data_juicer/config/config.py b/data_juicer/config/config.py
index 96c8498b5..86f0c411f 100644
--- a/data_juicer/config/config.py
+++ b/data_juicer/config/config.py
@@ -920,3 +920,36 @@ def get_init_configs(cfg: Union[Namespace, Dict]):
         json.dump(cfg, f)
     inited_dj_cfg = init_configs(['--config', temp_file])
     return inited_dj_cfg
+
+
+def get_default_cfg():
+    """Get default config values from config_all.yaml"""
+    cfg = Namespace()
+
+    # Get path to config_all.yaml
+    config_dir = os.path.dirname(os.path.abspath(__file__))
+    default_config_path = os.path.join(config_dir,
+                                       '../../configs/config_all.yaml')
+
+    # Load default values from yaml
+    with open(default_config_path, 'r', encoding='utf-8') as f:
+        defaults = yaml.safe_load(f)
+
+    # Convert to flat dictionary for namespace
+    flat_defaults = {
+        'executor_type': 'default',
+        'ray_address': 'auto',
+        'suffixes': None,
+        'text_keys': 'text',
+        'add_suffix': False,
+        'export_path': './outputs',
+        # Add other top-level keys from config_all.yaml
+        **defaults
+    }
+
+    # Update cfg with defaults
+    for key, value in flat_defaults.items():
+        if not hasattr(cfg, key):
+            setattr(cfg, key, value)
+
+    return cfg
diff --git a/data_juicer/core/executor/local_executor.py b/data_juicer/core/executor/local_executor.py
index 8b24ecd22..6d4fdc636 100644
--- a/data_juicer/core/executor/local_executor.py
+++ b/data_juicer/core/executor/local_executor.py
@@ -36,7 +36,7 @@ def __init__(self, cfg: Optional[Namespace] = None):
         :param cfg: optional jsonargparse Namespace.
         """
         super().__init__(cfg)
-        self.executor_type = 'local'
+        self.executor_type = 'default'
         self.work_dir = self.cfg.work_dir
 
         self.tracer = None
diff --git a/demos/data_mixture/app.py b/demos/data_mixture/app.py
index cc8efefb6..c05358806 100644
--- a/demos/data_mixture/app.py
+++ b/demos/data_mixture/app.py
@@ -2,8 +2,8 @@
 
 import pandas as pd
 import streamlit as st
-
 from data_juicer.core.data.dataset_builder import DatasetBuilder
+from data_juicer.config import get_default_cfg
 
 if st.__version__ >= '1.23.0':
     data_editor = st.data_editor
@@ -96,7 +96,10 @@ def mix_dataset():
                     ' '.join([str(weight), ds_file])
                     for ds_file, weight in zip(ds_files, weights)
                 ])
-                df = pd.DataFrame(DatasetBuilder(data_path).load_dataset())
+                cfg = get_default_cfg()
+                cfg.dataset_path = data_path
+                dataset_builder = DatasetBuilder(cfg)
+                df = pd.DataFrame(dataset_builder.load_dataset())
 
                 st.session_state.dataset = df
             else:
diff --git a/tests/config/test_config_funcs.py b/tests/config/test_config_funcs.py
index 9ae5bd55e..87f3ff85c 100644
--- a/tests/config/test_config_funcs.py
+++ b/tests/config/test_config_funcs.py
@@ -5,7 +5,7 @@
 
 from jsonargparse import Namespace
 
-from data_juicer.config import init_configs
+from data_juicer.config import init_configs, get_default_cfg
 from data_juicer.ops import load_ops
 from data_juicer.utils.unittest_utils import DataJuicerTestCaseBase
 
@@ -276,5 +276,31 @@ def test_op_params_parsing(self):
                 self.assertIn(base_param_key, params)
 
 
+    def test_get_default_cfg(self):
+        """Test getting default configuration from config_all.yaml"""
+        # Get default config
+        cfg = get_default_cfg()
+        
+        # Verify basic default values
+        self.assertIsInstance(cfg, Namespace)
+        
+        # Test essential defaults
+        self.assertEqual(cfg.executor_type, 'default')
+        self.assertEqual(cfg.ray_address, 'auto')
+        self.assertEqual(cfg.text_keys, 'text')
+        self.assertEqual(cfg.add_suffix, False)
+        self.assertEqual(cfg.export_path, '/path/to/result/dataset.jsonl')
+        self.assertEqual(cfg.suffixes, [])
+        
+        # Test other important defaults from config_all.yaml
+        self.assertTrue(hasattr(cfg, 'np'))  # Number of processes
+        self.assertTrue(hasattr(cfg, 'use_cache'))  # Cache usage flag
+        self.assertTrue(hasattr(cfg, 'temp_dir'))  # Temporary directory
+        
+        # Test default values are of correct type
+        self.assertIsInstance(cfg.executor_type, str)
+        self.assertIsInstance(cfg.add_suffix, bool)
+        self.assertIsInstance(cfg.export_path, str)
+
 if __name__ == '__main__':
     unittest.main()