diff --git a/mindinsight/mindconverter/graph_based_converter/common/utils.py b/mindinsight/mindconverter/graph_based_converter/common/utils.py
index 4efcf31d..91825732 100644
--- a/mindinsight/mindconverter/graph_based_converter/common/utils.py
+++ b/mindinsight/mindconverter/graph_based_converter/common/utils.py
@@ -81,7 +81,7 @@ def build_feed_dict(onnx_model, input_nodes: dict):
         for node in onnx_model.graph.input
     }
     feed_dict = {
-        name: np.random.rand(*shape).astype(input_nodes_types[name.split(":")[0]])
+        name: np.random.rand(*shape).astype(input_nodes_types[name])
         for name, shape in input_nodes.items()
     }
     return feed_dict
diff --git a/mindinsight/mindconverter/graph_based_converter/framework.py b/mindinsight/mindconverter/graph_based_converter/framework.py
index 35c1052d..e1d822f8 100644
--- a/mindinsight/mindconverter/graph_based_converter/framework.py
+++ b/mindinsight/mindconverter/graph_based_converter/framework.py
@@ -83,7 +83,7 @@ def torch_installation_validation(func):
         type, inner function.
     """
 
-    def _f(graph_path: str, sample_shape: tuple, input_nodes: str, output_nodes: str,
+    def _f(graph_path: str, input_nodes: dict, output_nodes: List[str],
            output_folder: str, report_folder: str = None):
         # Check whether pytorch is installed.
         error_info = None
@@ -119,7 +119,7 @@ def torch_installation_validation(func):
             _print_error(error)
             sys.exit(0)
 
-        func(graph_path=graph_path, sample_shape=sample_shape,
+        func(graph_path=graph_path,
              input_nodes=input_nodes, output_nodes=output_nodes,
              output_folder=output_folder, report_folder=report_folder)
 
@@ -265,11 +265,12 @@ def main_graph_base_converter(file_config):
     if not file_config.get("shape"):
         raise ParamMissingError("Param missing, `--shape` is required when using graph mode.")
 
-    if graph_path.endswith("pth") and not file_config['input_nodes'] and \
-            file_config.get("shape") and len(file_config.get("shape")) == 1:
+    if graph_path.endswith("pth") and not file_config.get("input_nodes", []) and \
+            file_config.get("shape") and len(file_config.get("shape", ())) == 1:
         file_config['input_nodes'] = ["input.1"]
 
-    if len(file_config['shape']) != len(file_config['input_nodes']) != len(set(file_config['input_nodes'])):
+    if len(file_config['shape']) != len(file_config.get("input_nodes", [])) != len(
+            set(file_config.get("input_nodes", []))):
         raise BadParamError("`--shape` and `--input_nodes` must have the same length, "
                             "and no redundant node in `--input_nodes`.")
 
diff --git a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/common.py b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/common.py
index 8551afc3..2c4eff66 100644
--- a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/common.py
+++ b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/common.py
@@ -17,12 +17,13 @@
 __all__ = ["context",
            "gen_hash_key",
            "DagGraph",
-           "MAX_OUT_DEGREE",
+           "MAX_DEGREE",
            "cal_matching_score",
            "ACCEPTABLE_RESULT_COUNT",
            "MINI_FREQUENCY",
            "SATISFIED_SCORE",
-           "MAX_ITERATION_DEPTH"]
+           "MAX_ITERATION_DEPTH_OF_MULTI_IPT",
+           "MAX_ITERATION_DEPTH_OF_SINGLE_IPT"]
 
 import math
 import copy
@@ -32,9 +33,10 @@ from typing import List
 
 from mindinsight.mindconverter.graph_based_converter.third_party_graph.onnx_utils import BaseNode
 
-MAX_OUT_DEGREE = 1
+MAX_DEGREE = 1
 MINI_FREQUENCY = 0.07
-MAX_ITERATION_DEPTH = 16
+MAX_ITERATION_DEPTH_OF_MULTI_IPT = 16
+MAX_ITERATION_DEPTH_OF_SINGLE_IPT = 8
 SATISFIED_SCORE = 0.74
 ACCEPTABLE_RESULT_COUNT = 32
 PTN_COVERAGE_THRESHOLD = 0.65
@@ -127,6 +129,7 @@ class AlgorithmContext:
     precursor_table = {}
     successor_table = {}
     outputs_table = {}
+    has_multi_inputs = False
 
     def set_init_node_collection(self, nd_col):
         """Init node_collection."""
diff --git a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/pattern.py b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/pattern.py
index 7a1f7018..2322402b 100644
--- a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/pattern.py
+++ b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/pattern.py
@@ -21,7 +21,6 @@ class Pattern:
 
     def __init__(self, pattern, pattern_length, in_degree, out_degree, ptn_items: list = None):
         self.pattern = pattern
-        self.count = 0
         self.start_index = []
         self.end_index = []
         self.module_name = None
@@ -37,6 +36,11 @@ class Pattern:
         self.additional_score = 0
         self.known_module_name = None
 
+    @property
+    def count(self):
+        """Count of the pattern."""
+        return len(self.start_index)
+
     def insert(self, idx, seq_len):
         """
         Insert a new position.
@@ -49,7 +53,6 @@ class Pattern:
             return
         self.start_index.append(idx)
         self.end_index.append(idx + seq_len)
-        self.count += 1
 
     def __str__(self):
         """Override `str()` method."""
diff --git a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/search_path.py b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/search_path.py
index 9278b464..6c197d96 100644
--- a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/search_path.py
+++ b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/search_path.py
@@ -21,7 +21,7 @@ from typing import Dict, List, Callable, Union
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.built_in_pattern import BUILT_IN_PATTERN, \
     is_built_in_pattern
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.common import context, gen_hash_key, DagGraph, \
-    MAX_OUT_DEGREE, cal_matching_score
+    MAX_DEGREE, cal_matching_score
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.known_module_name import BUILT_IN_MODULE_NAME
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.pattern import Pattern, scope_name_mapping
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.pattern_fuzzy_matching import \
@@ -390,7 +390,7 @@ def generate_pattern(topo_order: List[BaseNode], dag: DagGraph,
                                              dag=dag)
 
         in_degree, out_degree, _, _ = _get_pattern_degree(found_sequence, dag)
-        if out_degree > MAX_OUT_DEGREE:
+        if out_degree > MAX_DEGREE or (not context.has_multi_inputs and in_degree > MAX_DEGREE):
             cur_idx += 1
             continue
 
@@ -419,6 +419,7 @@ def _post_process_overlap(patterns) -> Dict:
                 patterns[name].start_index.pop(idx)
                 patterns[name].end_index.pop(idx)
                 continue
+            prev_end = patterns[name].end_index[idx]
             idx += 1
     return patterns
 
diff --git a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/searcher.py b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/searcher.py
index cde2c8fd..8ecefb71 100644
--- a/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/searcher.py
+++ b/mindinsight/mindconverter/graph_based_converter/sub_graph_searcher/searcher.py
@@ -17,9 +17,9 @@ from queue import PriorityQueue
 from typing import Dict, List
 
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.common import context, DagGraph, gen_hash_key, \
-    ACCEPTABLE_RESULT_COUNT
+    ACCEPTABLE_RESULT_COUNT, MAX_ITERATION_DEPTH_OF_SINGLE_IPT
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.common import MINI_FREQUENCY, \
-    MAX_ITERATION_DEPTH, SATISFIED_SCORE
+    MAX_ITERATION_DEPTH_OF_MULTI_IPT, SATISFIED_SCORE
 from mindinsight.mindconverter.graph_based_converter.common.global_context import GlobalContext
 from mindinsight.mindconverter.graph_based_converter.third_party_graph.onnx_utils import BaseNode
 from mindinsight.mindconverter.graph_based_converter.sub_graph_searcher.search_path import SearchPath, Pattern, \
@@ -37,7 +37,9 @@ def _is_satisfied(path):
     Returns:
         bool, True or False.
     """
-    if len(path.recursion_path) > MAX_ITERATION_DEPTH:
+    recursion_depth = MAX_ITERATION_DEPTH_OF_MULTI_IPT if context.has_multi_inputs \
+        else MAX_ITERATION_DEPTH_OF_SINGLE_IPT
+    if len(path.recursion_path) > recursion_depth:
         return True
     candidate_eval = any([is_pattern_satisfied(p, path) for p in path.new_pattern.values()])
     if not path.new_pattern or not candidate_eval:
@@ -262,6 +264,8 @@ def _build_connection(loader):
         context.successor_table[node_name] = list(node.get_successor_dict().keys())
         context.outputs_table[node_name] = node.output_name_list
 
+    # Record the model inputs count, use it to control the search algorithm.
+    context.has_multi_inputs = len(loader.input_nodes) > 1
     dag = DagGraph(nodes=context.node_collection.copy(),
                    precursor=context.precursor_table.copy(),
                    successor=context.successor_table.copy())
diff --git a/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_graph.py b/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_graph.py
index c36f8ee1..6bf1f36b 100644
--- a/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_graph.py
+++ b/mindinsight/mindconverter/graph_based_converter/third_party_graph/onnx_graph.py
@@ -202,6 +202,8 @@ class OnnxGraph(Graph):
         else:
             onnx_model = PyTorchGraphParser.parse(graph_path, **kwargs)
         onnx_inputs = [onnx_input.name for onnx_input in onnx_model.graph.input]
-        if input_nodes not in onnx_inputs:
-            raise ModelNotSupportError(f"input nodes({input_nodes}) is not in model inputs ({onnx_inputs}).")
+        for ipt in input_nodes:
+            if ipt not in onnx_inputs:
+                raise ModelNotSupportError(f"input nodes({input_nodes}) is not "
+                                           f"in model inputs ({onnx_inputs}).")
         return onnx_model
diff --git a/mindinsight/mindconverter/graph_based_converter/third_party_graph/optimizer.py b/mindinsight/mindconverter/graph_based_converter/third_party_graph/optimizer.py
index a6451e37..8b74ff3d 100644
--- a/mindinsight/mindconverter/graph_based_converter/third_party_graph/optimizer.py
+++ b/mindinsight/mindconverter/graph_based_converter/third_party_graph/optimizer.py
@@ -93,7 +93,8 @@ class OnnxSimplify:
         self._constant_nodes = copy.deepcopy(const_nodes)
 
     @ModelNotSupportError.check_except(
-        "Error occurs in loading model, please check your model or runtime environment integrity."
+        "Error occurs when loading model with given params, please check `--shape`, "
+        "`--input_nodes`, `--output_nodes`, `--model_file` or runtime environment integrity."
     )
     def _onnx_infer(self, infer_inputs_shape):
         """
diff --git a/mindinsight/mindconverter/graph_based_converter/third_party_graph/pytorch_graph_parser.py b/mindinsight/mindconverter/graph_based_converter/third_party_graph/pytorch_graph_parser.py
index eb8aa8de..f2763ed1 100644
--- a/mindinsight/mindconverter/graph_based_converter/third_party_graph/pytorch_graph_parser.py
+++ b/mindinsight/mindconverter/graph_based_converter/third_party_graph/pytorch_graph_parser.py
@@ -27,7 +27,8 @@ class PyTorchGraphParser(GraphParser):
 
     @classmethod
     @ModelNotSupportError.check_except(
-        "Error occurs in loading model, please check your model or runtime environment integrity."
+        "Error occurs when loading model with given params, please check `--shape`, "
+        "`--input_nodes`, `--output_nodes`, `--model_file` or runtime environment integrity."
     )
     def parse(cls, model_path: str, **kwargs):
         """
@@ -47,8 +48,9 @@ class PyTorchGraphParser(GraphParser):
             raise error
 
         try:
+            sample_shape = list(kwargs.get("input_nodes").values())[0]
             onnx_model_sim = cls._convert_pytorch_graph_to_onnx(
-                model_path, kwargs['sample_shape'], opset_version=11)
+                model_path, sample_shape, opset_version=11)
             return onnx_model_sim
 
         except ModuleNotFoundError:
diff --git a/mindinsight/mindconverter/graph_based_converter/third_party_graph/tf_graph_parser.py b/mindinsight/mindconverter/graph_based_converter/third_party_graph/tf_graph_parser.py
index 007b9e8c..0e152775 100644
--- a/mindinsight/mindconverter/graph_based_converter/third_party_graph/tf_graph_parser.py
+++ b/mindinsight/mindconverter/graph_based_converter/third_party_graph/tf_graph_parser.py
@@ -27,7 +27,8 @@ class TFGraphParser(GraphParser):
 
     @classmethod
     @ModelNotSupportError.check_except(
-        "Error occurs in loading model, please check your model or runtime environment integrity."
+        "Error occurs when loading model with given params, please check `--shape`, "
+        "`--input_nodes`, `--output_nodes`, `--model_file` or runtime environment integrity."
     )
     def parse(cls, model_path: str, **kwargs):
         """