diff --git a/python/tools/model.template b/python/tools/model.template
index ff1b531fb164f377036f9b5cf7898b74f280895a..a11ccf850fc0c3817d7dc7767450ad29cbcf84bc 100644
--- a/python/tools/model.template
+++ b/python/tools/model.template
@@ -10,13 +10,9 @@
 namespace mace {
 namespace {{tag}} {
 
-{% if tensor_info.data_type != 'DT_UINT8' %} alignas(4) {% endif %} unsigned char {{ tensor_info.name }}[] = {
-{% for d in tensor_info.data %}{{"0x%02X, " % d }}{%endfor%}
-};
-
-void Create{{tensor.name}}(std::vector<mace::ConstTensor> &tensors) {
+void Create{{tensor.name}}(std::vector<mace::ConstTensor> &tensors, const unsigned char *model_data) {
   tensors.emplace_back(mace::ConstTensor(
-      {{ tensor.name|tojson }}, {{ tensor.name }},
+      {{ tensor.name|tojson }}, const_cast<unsigned char *>(model_data) + {{ offset }},
       { {{ tensor.dims|join(', ') }} }, {{ tensor_info.data_type }}, {{ tensor.node_id }}));
 }
 
@@ -24,6 +20,42 @@ void Create{{tensor.name}}(std::vector<mace::ConstTensor> &tensors) {
 }  // namespace mace
 
 {% elif mode == 1 %}
+{% if not embed_model_data %}
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+{% endif %}
+
+namespace mace {
+namespace {{tag}} {
+
+{% if embed_model_data %}
+alignas(4) unsigned char model_data[{{ model_data_size }}] = {
+{% for d in model_data %}{{"0x%02X, " % d }}{%endfor%}
+};
+{% endif %}
+
+unsigned char *LoadModelData(const char *model_data_file) {
+{% if embed_model_data %}
+  return model_data;
+{% else %}
+  int fd=open(model_data_file, O_RDONLY);
+  unsigned char *model_data = (unsigned char *)mmap(nullptr, {{ model_data_size }}, PROT_READ, MAP_PRIVATE, fd, 0);
+  close(fd);
+  return model_data;
+{% endif %}
+}
+
+void UnloadModelData(unsigned char *model_data) {
+{% if not embed_model_data %}
+  munmap(model_data, {{ model_data_size }});
+{% endif %}
+}
+
+}  // namespace {{tag}}
+}  // namespace mace
+
+{% elif mode == 2 %}
 #include <vector>
 #include <string>
 #include "mace/core/public/mace.h"
@@ -134,7 +166,7 @@ namespace mace {
 namespace {{tag}} {
 
 {% for tensor in tensors %}
-extern void Create{{ tensor.name }}(std::vector<mace::ConstTensor> &tensors);
+extern void Create{{ tensor.name }}(std::vector<mace::ConstTensor> &tensors, const unsigned char *model_data);
 {% endfor %}
 
 
@@ -209,12 +241,12 @@ void CreateOperators(std::vector<mace::OperatorDef> &ops) {
 
 }
 
-void CreateTensors(std::vector<mace::ConstTensor> &tensors) {
+void CreateTensors(std::vector<mace::ConstTensor> &tensors, const unsigned char *model_data) {
   tensors.reserve({{ net.tensors|length }});
 
   {% for tensor in net.tensors %}
 
-  mace::{{tag}}::Create{{tensor.name}}(tensors);
+  mace::{{tag}}::Create{{tensor.name}}(tensors, model_data);
   {% endfor %}
 
 }
@@ -239,7 +271,7 @@ void CreateMemoryArena(mace::MemoryArena &mem_arena) {
 namespace mace {
 namespace {{tag}} {
 
-NetDef CreateNet() {
+NetDef CreateNet(const unsigned char *model_data) {
   NetDef net_def;
   net_def.set_name("{{ net.name}}");
   net_def.set_version("{{ net.version }}");
@@ -250,7 +282,7 @@ NetDef CreateNet() {
 
   CreateOperators(net_def.mutable_op());
 
-  CreateTensors(net_def.mutable_tensors());
+  CreateTensors(net_def.mutable_tensors(), model_data);
 
   {% if net.mem_arena.mem_block|length != 0 %}
   CreateMemoryArena(net_def.mutable_mem_arena());
diff --git a/python/tools/source_converter_lib.py b/python/tools/source_converter_lib.py
index d842ffab49631f597cfb9e8925cd2f876e029106..c7061b98b65b425a5cdfe0901fa054609427ea78 100644
--- a/python/tools/source_converter_lib.py
+++ b/python/tools/source_converter_lib.py
@@ -91,7 +91,7 @@ class TensorInfo:
 def stringfy(value):
   return ', '.join('"{0}"'.format(w) for w in value)
 
-def convert_to_source(net_def, mode_pb_checksum, template, obfuscate, model_tag, output, runtime):
+def convert_to_source(net_def, mode_pb_checksum, template, obfuscate, model_tag, output, runtime, embed_model_data):
   if obfuscate:
     obfuscate_name(net_def)
   else:
@@ -109,18 +109,44 @@ def convert_to_source(net_def, mode_pb_checksum, template, obfuscate, model_tag,
   counter = 0
   output_dir = os.path.dirname(output) + '/'
   # generate tensor source files
+  model_data = []
+  offset = 0
   for t in net_def.tensors:
+    tensor_info = TensorInfo(t, runtime)
+    # align
+    if tensor_info.data_type != 'DT_UINT8' and offset % 4 != 0:
+      padding = 4 - offset % 4
+      model_data.extend(bytearray([0] * padding))
+      offset += padding
     source = j2_env.get_template(template_name).render(
       tensor_info = TensorInfo(t, runtime),
       tensor = t,
       tag = model_tag,
       mode = 0,
       runtime = runtime,
+      offset = offset,
     )
+    model_data.extend(tensor_info.data)
+    offset += len(tensor_info.data)
     with gfile.GFile(output_dir + 'tensor' + str(counter) + '.cc', "wb") as f:
       f.write(source)
     counter += 1
 
+  # generate tensor data
+  source = j2_env.get_template(template_name).render(
+    tag = model_tag,
+    mode = 1,
+    embed_model_data = embed_model_data,
+    model_data_size = offset,
+    model_data = model_data
+  )
+  with gfile.GFile(output_dir + 'tensor_data' + '.cc', "wb") as f:
+    f.write(source)
+  if not embed_model_data:
+    f = open(output_dir + model_tag + '.data', "wb")
+    f.write(bytearray(model_data))
+    f.close()
+
   # generate op source files
   counter = 0
   op_size = len(net_def.op)
@@ -130,7 +156,7 @@ def convert_to_source(net_def, mode_pb_checksum, template, obfuscate, model_tag,
       end = min(start+10, op_size),
       net = net_def,
       tag = model_tag,
-      mode = 1,
+      mode = 2,
       runtime = runtime,
     )
     with gfile.GFile(output_dir + 'op' + str(counter) + '.cc', "wb") as f:
@@ -143,9 +169,9 @@ def convert_to_source(net_def, mode_pb_checksum, template, obfuscate, model_tag,
     tensors = tensors,
     net = net_def,
     tag = model_tag,
-    mode = 2,
+    mode = 3,
     runtime = runtime,
-    model_pb_checksum = mode_pb_checksum,
+    model_pb_checksum = mode_pb_checksum
   )
   with gfile.GFile(output, "wb") as f:
     f.write(source)
diff --git a/python/tools/tf_converter.py b/python/tools/tf_converter.py
index 0da5420fd954646679511335647d63a63867c1c1..4ad8bddd1531c81aacdecc08f5d9081905876a30 100644
--- a/python/tools/tf_converter.py
+++ b/python/tools/tf_converter.py
@@ -43,7 +43,7 @@ def main(unused_args):
 
   if FLAGS.output_type == 'source':
     source_converter_lib.convert_to_source(output_graph_def, mode_pb_checksum, FLAGS.template, FLAGS.obfuscate,
-      FLAGS.model_tag, FLAGS.output, FLAGS.runtime)
+      FLAGS.model_tag, FLAGS.output, FLAGS.runtime, FLAGS.embed_model_data)
   else:
     with gfile.GFile(FLAGS.output, "wb") as f:
       f.write(output_graph_def.SerializeToString())
@@ -133,6 +133,11 @@ def parse_args():
     type=str,
     default="",
     help="input shape.")
+  parser.add_argument(
+    "--embed_model_data",
+    type=str2bool,
+    default=True,
+    help="input shape.")
   return parser.parse_known_args()