diff --git a/osschat_insert.py b/osschat_insert.py
index 3893947..fc454a9 100644
--- a/osschat_insert.py
+++ b/osschat_insert.py
@@ -67,7 +67,16 @@ def _get_embedding_op(config):
         return False, ops.sentence_embedding.openai(model_name=config.embedding_model, api_key=config.openai_api_key)
     raise RuntimeError('Unknown model: [%s], only support: %s' % (config.embedding_model, _hf_models + _sbert_models + _openai_models))
 
-
+def data_loader(path):
+    if path.endswith('pdf'):
+        op = ops.data_loader.pdf_loader()
+    elif path.endswith(('xls', 'xslx')):
+        op = ops.data_loader.excel_loader()
+    elif path.endswith('ppt'):
+        op = ops.data_loader.powerpoint_loader()
+    else:
+        op = ops.text_loader()
+    return op(path)
 
 @AutoPipes.register
 def osschat_insert_pipe(config):
@@ -91,7 +100,7 @@ def osschat_insert_pipe(config):
     
     p = (
         pipe.input('doc', 'project_name')
-            .map('doc', 'text', ops.text_loader())
+            .map('doc', 'text', data_loader)
             .flat_map('text', 'sentence', text_split_op)
             .map('sentence', 'embedding', sentence_embedding_op, config=sentence_embedding_config)
     )