diff --git a/.cspell.json b/.cspell.json
index 1d97d3c469d2..b13c4312bc22 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -217,10 +217,11 @@
     "dcid",
     "piezo",
     "Piezo",
-    "cmpop"
+    "cmpop",
+    "omap"
   ],
   "flagWords": [
     "Prompt Flow"
   ],
   "allowCompoundWords": true
-}
\ No newline at end of file
+}
diff --git a/src/promptflow-core/promptflow/_utils/flow_utils.py b/src/promptflow-core/promptflow/_utils/flow_utils.py
index 113b500b5d24..de932780890c 100644
--- a/src/promptflow-core/promptflow/_utils/flow_utils.py
+++ b/src/promptflow-core/promptflow/_utils/flow_utils.py
@@ -6,7 +6,6 @@
 import json
 import os
 import re
-from collections import OrderedDict
 from os import PathLike
 from pathlib import Path
 from typing import Optional, Tuple, Union
@@ -22,7 +21,7 @@
 )
 from promptflow._core._errors import MetaFileNotFound, MetaFileReadError
 from promptflow._utils.logger_utils import LoggerFactory
-from promptflow._utils.utils import strip_quotation
+from promptflow._utils.utils import convert_ordered_dict_to_dict, strip_quotation
 from promptflow._utils.yaml_utils import dump_yaml, load_yaml
 from promptflow.contracts.flow import Flow as ExecutableFlow
 from promptflow.exceptions import ErrorTarget, UserErrorException, ValidationException
@@ -157,10 +156,9 @@ def dump_flow_dag(flow_dag: dict, flow_path: Path):
     """Dump flow dag to given flow path."""
     flow_dir, flow_filename = resolve_flow_path(flow_path, check_flow_exist=False)
     flow_path = flow_dir / flow_filename
-    if isinstance(flow_dag, OrderedDict):
-        flow_dag = dict(flow_dag)
     with open(flow_path, "w", encoding=DEFAULT_ENCODING) as f:
-        dump_yaml(flow_dag, f)
+        # directly dumping ordered dict will bring !!omap tag in yaml
+        dump_yaml(convert_ordered_dict_to_dict(flow_dag), f)
     return flow_path
 
 
diff --git a/src/promptflow-core/promptflow/_utils/utils.py b/src/promptflow-core/promptflow/_utils/utils.py
index 7af01b617745..85a35eaef766 100644
--- a/src/promptflow-core/promptflow/_utils/utils.py
+++ b/src/promptflow-core/promptflow/_utils/utils.py
@@ -434,3 +434,48 @@ def strip_quotation(value):
         return value[1:-1]
     else:
         return value
+
+
+def is_empty_target(obj: Optional[Dict]) -> bool:
+    """Determines if it's empty target
+
+    :param obj: The object to check
+    :type obj: Optional[Dict]
+    :return: True if obj is None or an empty Dict
+    :rtype: bool
+    """
+    return (
+        obj is None
+        # some objs have overloaded "==" and will cause error. e.g CommandComponent obj
+        or (isinstance(obj, dict) and len(obj) == 0)
+    )
+
+
+def convert_ordered_dict_to_dict(target_object: Union[Dict, List], remove_empty: bool = True) -> Union[Dict, List]:
+    """Convert ordered dict to dict. Remove keys with None value.
+    This is a workaround for rest request must be in dict instead of
+    ordered dict.
+
+    :param target_object: The object to convert
+    :type target_object: Union[Dict, List]
+    :param remove_empty: Whether to omit values that are None or empty dictionaries. Defaults to True.
+    :type remove_empty: bool
+    :return: Converted ordered dict with removed None values
+    :rtype: Union[Dict, List]
+    """
+    # OrderedDict can appear nested in a list
+    if isinstance(target_object, list):
+        new_list = []
+        for item in target_object:
+            item = convert_ordered_dict_to_dict(item)
+            if not is_empty_target(item) or not remove_empty:
+                new_list.append(item)
+        return new_list
+    if isinstance(target_object, dict):
+        new_dict = {}
+        for key, value in target_object.items():
+            value = convert_ordered_dict_to_dict(value)
+            if not is_empty_target(value) or not remove_empty:
+                new_dict[key] = value
+        return new_dict
+    return target_object