diff --git a/jubatus/core/classifier/classifier_base.hpp b/jubatus/core/classifier/classifier_base.hpp
index 826a5bb4..88936cd8 100644
--- a/jubatus/core/classifier/classifier_base.hpp
+++ b/jubatus/core/classifier/classifier_base.hpp
@@ -59,6 +59,8 @@ class classifier_base {
 
   virtual void pack(framework::packer& pk) const = 0;
   virtual void unpack(msgpack::object o) = 0;
+  virtual void export_model(framework::packer& pk) const = 0;
+  virtual void import_model(msgpack::object o) = 0;
   virtual void clear() = 0;
 
   virtual framework::mixable* get_mixable() = 0;
diff --git a/jubatus/core/classifier/linear_classifier.cpp b/jubatus/core/classifier/linear_classifier.cpp
index ea4723f0..ed3b5e28 100644
--- a/jubatus/core/classifier/linear_classifier.cpp
+++ b/jubatus/core/classifier/linear_classifier.cpp
@@ -207,6 +207,13 @@ void linear_classifier::pack(framework::packer& pk) const {
 void linear_classifier::unpack(msgpack::object o) {
   storage_->unpack(o);
 }
+void linear_classifier::export_model(framework::packer& pk) const {
+  // TODO
+}
+
+void linear_classifier::import_model(msgpack::object o) {
+  // TODO
+}
 
 framework::mixable* linear_classifier::get_mixable() {
   return &mixable_storage_;
diff --git a/jubatus/core/classifier/linear_classifier.hpp b/jubatus/core/classifier/linear_classifier.hpp
index 020ea160..b704f198 100644
--- a/jubatus/core/classifier/linear_classifier.hpp
+++ b/jubatus/core/classifier/linear_classifier.hpp
@@ -69,6 +69,8 @@ class linear_classifier : public classifier_base {
 
   void pack(framework::packer& pk) const;
   void unpack(msgpack::object o);
+  void export_model(framework::packer& pk) const;
+  void import_model(msgpack::object o);
 
   framework::mixable* get_mixable();
 
diff --git a/jubatus/core/classifier/nearest_neighbor_classifier.cpp b/jubatus/core/classifier/nearest_neighbor_classifier.cpp
index dc4cdcdf..d35d8fac 100644
--- a/jubatus/core/classifier/nearest_neighbor_classifier.cpp
+++ b/jubatus/core/classifier/nearest_neighbor_classifier.cpp
@@ -225,6 +225,14 @@ void nearest_neighbor_classifier::unpack(msgpack::object o) {
   }
 }
 
+void nearest_neighbor_classifier::export_model(framework::packer& pk) const {
+  // TODO
+}
+void nearest_neighbor_classifier::import_model(msgpack::object o) {
+  // TODO
+}
+
+
 framework::mixable* nearest_neighbor_classifier::get_mixable() {
   return nearest_neighbor_engine_->get_mixable();
 }
diff --git a/jubatus/core/classifier/nearest_neighbor_classifier.hpp b/jubatus/core/classifier/nearest_neighbor_classifier.hpp
index 4f47ff91..37893775 100644
--- a/jubatus/core/classifier/nearest_neighbor_classifier.hpp
+++ b/jubatus/core/classifier/nearest_neighbor_classifier.hpp
@@ -63,6 +63,8 @@ class nearest_neighbor_classifier : public classifier_base {
 
   void pack(framework::packer& pk) const;
   void unpack(msgpack::object o);
+  void export_model(framework::packer& pk) const;
+  void import_model(msgpack::object o);
 
   framework::mixable* get_mixable();
 
diff --git a/jubatus/core/common/byte_buffer.hpp b/jubatus/core/common/byte_buffer.hpp
index 9becfbf7..2a4fe4be 100644
--- a/jubatus/core/common/byte_buffer.hpp
+++ b/jubatus/core/common/byte_buffer.hpp
@@ -20,6 +20,7 @@
 #include <stdint.h>
 #include <vector>
 #include <cstring>
+#include <memory>
 #include <msgpack.hpp>
 #include "jubatus/util/lang/shared_ptr.h"
 
@@ -41,6 +42,12 @@ class byte_buffer {
     buf_.reset(new std::vector<char>(first, first+size));
   }
 
+	void write(const char* buf, unsigned int len) {
+    const size_t old_tail = buf_->size();
+    buf_->resize(buf_->size() + len);
+    std::memcpy(buf_->data() + old_tail, buf, len);
+  }
+
   // following member functions are implicily defined:
   //   byte_buffer(const byte_buffer& b) = default;
   //   byte_buffer& operator=(const byte_buffer& b) = default;
diff --git a/jubatus/core/common/export_model.hpp b/jubatus/core/common/export_model.hpp
new file mode 100644
index 00000000..a934fd43
--- /dev/null
+++ b/jubatus/core/common/export_model.hpp
@@ -0,0 +1,28 @@
+// Jubatus: Online machine learning framework for distributed environment
+// Copyright (C) 2014 Preferred Infrastructure and Nippon Telegraph and Telephone Corporation.
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License version 2.1 as published by the Free Software Foundation.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+
+#ifndef JUBATUS_CORE_COMMON_EXPORT_MODEL_HPP__
+#define JUBATUS_CORE_COMMON_EXPORT_MODEL_HPP__
+
+#include <msgpack.hpp>
+#include "../framework/packer.hpp"
+
+#define JUBATUS_EXPORT_MODEL(...)                                   \
+  void export_model(framework::packer& pk) const {                  \
+    msgpack::type::make_define(__VA_ARGS__).msgpack_pack(pk);       \
+  }
+
+#endif  // JUBATUS_CORE_COMMON_EXPORT_MODEL_HPP_
diff --git a/jubatus/core/driver/classifier.cpp b/jubatus/core/driver/classifier.cpp
index b4293ca0..78895429 100644
--- a/jubatus/core/driver/classifier.cpp
+++ b/jubatus/core/driver/classifier.cpp
@@ -7,12 +7,12 @@
 //
 // This library is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of
-// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
 // Lesser General Public License for more details.
 //
 // You should have received a copy of the GNU Lesser General Public
 // License along with this library; if not, write to the Free Software
-// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA	02110-1301	USA
 
 #include "classifier.hpp"
 
@@ -24,6 +24,9 @@
 #include "../classifier/classifier_factory.hpp"
 #include "../classifier/classifier_base.hpp"
 #include "../common/vector_util.hpp"
+#include "../common/byte_buffer.hpp"
+#include "../framework/stream_writer.hpp"
+#include "../framework/packer.hpp"
 #include "../fv_converter/datum.hpp"
 #include "../fv_converter/datum_to_fv_converter.hpp"
 #include "../fv_converter/converter_config.hpp"
@@ -31,6 +34,7 @@
 
 using std::string;
 using std::vector;
+using std::make_pair;
 using jubatus::util::lang::shared_ptr;
 using jubatus::core::fv_converter::weight_manager;
 using jubatus::core::fv_converter::mixable_weight_manager;
@@ -55,40 +59,40 @@ classifier::~classifier() {
 }
 
 void classifier::train(const string& label, const fv_converter::datum& data) {
-  common::sfv_t v;
-  converter_->convert_and_update_weight(data, v);
-  common::sort_and_merge(v);
-  classifier_->train(v, label);
+	common::sfv_t v;
+	converter_->convert_and_update_weight(data, v);
+	common::sort_and_merge(v);
+	classifier_->train(v, label);
 }
 
 jubatus::core::classifier::classify_result classifier::classify(
-    const fv_converter::datum& data) const {
-  common::sfv_t v;
-  converter_->convert(data, v);
+		const fv_converter::datum& data) const {
+	common::sfv_t v;
+	converter_->convert(data, v);
 
-  jubatus::core::classifier::classify_result scores;
-  classifier_->classify_with_scores(v, scores);
-  return scores;
+	jubatus::core::classifier::classify_result scores;
+	classifier_->classify_with_scores(v, scores);
+	return scores;
 }
 
 void classifier::get_status(std::map<string, string>& status) const {
-  classifier_->get_status(status);
+	classifier_->get_status(status);
 }
 
 bool classifier::delete_label(const std::string& label) {
-  return classifier_->delete_label(label);
+	return classifier_->delete_label(label);
 }
 
 void classifier::clear() {
-  classifier_->clear();
-  converter_->clear_weights();
+	classifier_->clear();
+	converter_->clear_weights();
 }
 
 std::vector<std::string> classifier::get_labels() const {
-  return classifier_->get_labels();
+	return classifier_->get_labels();
 }
 bool classifier::set_label(const std::string& label) {
-  return classifier_->set_label(label);
+	return classifier_->set_label(label);
 }
 
 void classifier::pack(framework::packer& pk) const {
@@ -109,6 +113,38 @@ void classifier::unpack(msgpack::object o) {
   wm_.get_model()->unpack(o.via.array.ptr[1]);
 }
 
-}  // namespace driver
-}  // namespace core
-}  // namespace jubatus
+struct versioned_model {
+	// this struct is version compatible
+	std::string version;
+	common::byte_buffer buffer;
+	versioned_model(const std::string& v, const common::byte_buffer& b)
+		: version(v), buffer(b) {
+	}
+	MSGPACK_DEFINE(version, buffer);
+};
+
+void classifier::import_model(common::byte_buffer& from) const {
+	// not implemented yet
+}
+
+common::byte_buffer classifier::export_model() const {
+	common::byte_buffer model;
+	framework::stream_writer<common::byte_buffer> model_writer(model);
+  core::framework::jubatus_packer jp(model_writer);
+  core::framework::packer pk(jp);
+//	msgpack::packer<common::byte_buffer> pk(model);
+	classifier_->export_model(pk);
+	wm_->export_model(pk);
+	{
+		common::byte_buffer ret;
+		msgpack::pack(ret,
+									versioned_model(JUBATUS_CORE_VERSION,
+																	model));
+		return ret;
+	}
+}
+
+
+}	 // namespace driver
+}	 // namespace core
+}	 // namespace jubatus
diff --git a/jubatus/core/driver/classifier.hpp b/jubatus/core/driver/classifier.hpp
index 34e9b93c..5e5607b5 100644
--- a/jubatus/core/driver/classifier.hpp
+++ b/jubatus/core/driver/classifier.hpp
@@ -21,6 +21,7 @@
 #include <string>
 #include <vector>
 #include "jubatus/util/lang/shared_ptr.h"
+#include "../common/byte_buffer.hpp"
 #include "../classifier/classifier_type.hpp"
 #include "../framework/mixable.hpp"
 #include "../fv_converter/mixable_weight_manager.hpp"
@@ -60,6 +61,9 @@ class classifier : public driver_base {
   void pack(framework::packer& pk) const;
   void unpack(msgpack::object o);
 
+  void import_model(common::byte_buffer& from) const;
+  common::byte_buffer export_model() const;
+
   std::vector<std::string> get_labels() const;
   bool set_label(const std::string& label);
 
diff --git a/jubatus/core/fv_converter/datum_to_fv_converter.cpp b/jubatus/core/fv_converter/datum_to_fv_converter.cpp
index 57103d20..d3b5b27e 100644
--- a/jubatus/core/fv_converter/datum_to_fv_converter.cpp
+++ b/jubatus/core/fv_converter/datum_to_fv_converter.cpp
@@ -343,6 +343,10 @@ class datum_to_fv_converter_impl {
     }
   }
 
+  void export_model(framework::packer& pk) {
+    
+  }
+
  private:
   void filter_strings(
       const datum::sv_t& string_values,
@@ -658,6 +662,11 @@ void datum_to_fv_converter::clear_weights() {
   pimpl_->clear_weights();
 }
 
+void datum_to_fv_converter::export_model(framework::packer& pk) {
+  pimpl_->export_model(pk);
+}
+
+
 }  // namespace fv_converter
 }  // namespace core
 }  // namespace jubatus
diff --git a/jubatus/core/fv_converter/datum_to_fv_converter.hpp b/jubatus/core/fv_converter/datum_to_fv_converter.hpp
index 20f96ff6..a1e78bee 100644
--- a/jubatus/core/fv_converter/datum_to_fv_converter.hpp
+++ b/jubatus/core/fv_converter/datum_to_fv_converter.hpp
@@ -25,6 +25,7 @@
 #include "jubatus/util/lang/scoped_ptr.h"
 #include "../common/type.hpp"
 #include "../framework/mixable.hpp"
+#include "../framework/packer.hpp"
 
 namespace jubatus {
 namespace core {
@@ -120,6 +121,9 @@ class datum_to_fv_converter {
   void set_weight_manager(jubatus::util::lang::shared_ptr<weight_manager> wm);
   void clear_weights();
 
+  void import_model(framework::packer& pk);
+  void export_model(framework::packer& pk);
+
  private:
   jubatus::util::lang::scoped_ptr<datum_to_fv_converter_impl> pimpl_;
 };
diff --git a/jubatus/core/fv_converter/weight_manager.hpp b/jubatus/core/fv_converter/weight_manager.hpp
index 0e854519..bdf731cc 100644
--- a/jubatus/core/fv_converter/weight_manager.hpp
+++ b/jubatus/core/fv_converter/weight_manager.hpp
@@ -26,6 +26,7 @@
 #include "../framework/model.hpp"
 #include "../common/type.hpp"
 #include "../common/version.hpp"
+#include "../common/export_model.hpp"
 #include "keyword_weights.hpp"
 
 namespace jubatus {
@@ -89,6 +90,8 @@ class weight_manager : public framework::model {
   }
 
   MSGPACK_DEFINE(version_, diff_weights_, master_weights_);
+  JUBATUS_EXPORT_MODEL(version_, master_weights_);
+  void import_model(msgpack::object o);
 
   void pack(framework::packer& pk) const {
     pk.pack(*this);
diff --git a/jubatus/core/storage/local_storage.cpp b/jubatus/core/storage/local_storage.cpp
index 263466af..930032e2 100644
--- a/jubatus/core/storage/local_storage.cpp
+++ b/jubatus/core/storage/local_storage.cpp
@@ -221,6 +221,10 @@ void local_storage::unpack(msgpack::object o) {
   o.convert(this);
 }
 
+void local_storage::import_model(msgpack::object o) {
+  o.convert(this);
+}
+
 std::string local_storage::type() const {
   return "local_storage";
 }
diff --git a/jubatus/core/storage/local_storage.hpp b/jubatus/core/storage/local_storage.hpp
index d25b46c0..b5a9fd66 100644
--- a/jubatus/core/storage/local_storage.hpp
+++ b/jubatus/core/storage/local_storage.hpp
@@ -24,6 +24,7 @@
 #include "storage_base.hpp"
 #include "../common/key_manager.hpp"
 #include "../common/version.hpp"
+#include "../common/export_model.hpp"
 
 namespace jubatus {
 namespace core {
@@ -80,12 +81,15 @@ class local_storage : public storage_base {
 
   void pack(framework::packer& packer) const;
   void unpack(msgpack::object o);
+
   storage::version get_version() const {
     return storage::version();
   }
   std::string type() const;
 
   MSGPACK_DEFINE(tbl_, class2id_);
+  JUBATUS_EXPORT_MODEL(tbl_, class2id_);
+  void import_model(msgpack::object o);
 
  private:
   // map_features3_t tbl_;
diff --git a/jubatus/core/storage/local_storage_mixture.hpp b/jubatus/core/storage/local_storage_mixture.hpp
index c25d3553..22b1c7d9 100644
--- a/jubatus/core/storage/local_storage_mixture.hpp
+++ b/jubatus/core/storage/local_storage_mixture.hpp
@@ -88,6 +88,8 @@ class local_storage_mixture : public storage_base {
   std::string type() const;
 
   MSGPACK_DEFINE(tbl_, class2id_, tbl_diff_, model_version_);
+  JUBATUS_EXPORT_MODEL(tbl_, class2id_, model_version_);
+  void import_model(msgpack::object o);
 
  private:
   bool get_internal(const std::string& feature, id_feature_val3_t& ret) const;
diff --git a/jubatus/core/storage/storage_base.hpp b/jubatus/core/storage/storage_base.hpp
index f5ed4e4c..4b214214 100644
--- a/jubatus/core/storage/storage_base.hpp
+++ b/jubatus/core/storage/storage_base.hpp
@@ -29,6 +29,7 @@
 #include "../common/exception.hpp"
 #include "../common/type.hpp"
 #include "../framework/model.hpp"
+#include "../framework/packer.hpp"
 
 namespace jubatus {
 namespace core {
@@ -63,6 +64,8 @@ class storage_base : public framework::model {
 
   virtual void pack(framework::packer& packer) const = 0;
   virtual void unpack(msgpack::object o) = 0;
+  virtual void export_model(framework::packer& pk) const = 0;
+  virtual void import_model(msgpack::object o) = 0;
 
   virtual version get_version() const = 0;