diff --git a/CMakeLists.txt b/CMakeLists.txt
index dcd1218a5b0b62f2739b727391aca31b48ed9ccb..f0a01680aa03495a8da3ce4e28b3536dbcf69e61 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -27,7 +27,7 @@ if(NOT CMAKE_CROSSCOMPILING)
 endif(NOT CMAKE_CROSSCOMPILING)
 find_package(Git REQUIRED)
 find_package(Threads REQUIRED)
-if(NOT ANDROID)
+if(NOT ANDROID AND NOT IOS)
     find_package(Boost QUIET)
 endif()
 
@@ -63,6 +63,21 @@ if(NOT CMAKE_BUILD_TYPE)
       FORCE)
 endif()
 
+if(IOS)
+    set(WITH_GPU OFF CACHE STRING
+        "Disable GPU when cross-compiling for Android" FORCE)
+    set(WITH_AVX OFF CACHE STRING
+        "Disable AVX when cross-compiling for Android" FORCE)
+    set(WITH_PYTHON OFF CACHE STRING
+        "Disable PYTHON when cross-compiling for Android" FORCE)
+    set(WITH_RDMA OFF CACHE STRING
+        "Disable RDMA when cross-compiling for Android" FORCE)
+    set(WITH_MKLDNN OFF CACHE STRING
+        "Disable MKLDNN when cross-compiling for Android" FORCE)
+    set(WITH_MKLML OFF CACHE STRING
+        "Disable MKLML package when cross-compiling for Android" FORCE)
+endif(IOS)
+
 if(ANDROID)
     if(${CMAKE_SYSTEM_VERSION} VERSION_LESS "21")
         message(FATAL_ERROR "Unsupport standalone toolchains with Android API level lower than 21")
diff --git a/cmake/cross_compiling/ios.cmake b/cmake/cross_compiling/ios.cmake
new file mode 100644
index 0000000000000000000000000000000000000000..b179e29b25cdb2c9ebeab04c5ec5eb3e58819750
--- /dev/null
+++ b/cmake/cross_compiling/ios.cmake
@@ -0,0 +1,207 @@
+# This file is based off of the Platform/Darwin.cmake and Platform/UnixPaths.cmake
+# files which are included with CMake 2.8.4
+# It has been altered for iOS development
+
+# Options:
+#
+# IOS_PLATFORM = OS (default) or SIMULATOR
+#   This decides if SDKS will be selected from the iPhoneOS.platform or iPhoneSimulator.platform folders
+#   OS - the default, used to build for iPhone and iPad physical devices, which have an arm arch.
+#   SIMULATOR - used to build for the Simulator platforms, which have an x86 arch.
+#
+# CMAKE_IOS_DEVELOPER_ROOT = automatic(default) or /path/to/platform/Developer folder
+#   By default this location is automatcially chosen based on the IOS_PLATFORM value above.
+#   If set manually, it will override the default location and force the user of a particular Developer Platform
+#
+# CMAKE_IOS_SDK_ROOT = automatic(default) or /path/to/platform/Developer/SDKs/SDK folder
+#   By default this location is automatcially chosen based on the CMAKE_IOS_DEVELOPER_ROOT value.
+#   In this case it will always be the most up-to-date SDK found in the CMAKE_IOS_DEVELOPER_ROOT path.
+#   If set manually, this will force the use of a specific SDK version
+
+# Macros:
+#
+# set_xcode_property (TARGET XCODE_PROPERTY XCODE_VALUE)
+#  A convenience macro for setting xcode specific properties on targets
+#  example: set_xcode_property (myioslib IPHONEOS_DEPLOYMENT_TARGET "3.1")
+#
+# find_host_package (PROGRAM ARGS)
+#  A macro used to find executable programs on the host system, not within the iOS environment.
+#  Thanks to the android-cmake project for providing the command
+
+# Standard settings
+# set (CMAKE_SYSTEM_NAME Darwin)
+set (CMAKE_SYSTEM_VERSION 1)
+set (UNIX True)
+set (APPLE True)
+set (IOS True)
+
+# Required as of cmake 2.8.10
+set (CMAKE_OSX_DEPLOYMENT_TARGET "" CACHE STRING "Force unset of the deployment target for iOS" FORCE)
+
+# Determine the cmake host system version so we know where to find the iOS SDKs
+find_program (CMAKE_UNAME uname /bin /usr/bin /usr/local/bin)
+if (CMAKE_UNAME)
+    exec_program(uname ARGS -r OUTPUT_VARIABLE CMAKE_HOST_SYSTEM_VERSION)
+    string (REGEX REPLACE "^([0-9]+)\\.([0-9]+).*$" "\\1" DARWIN_MAJOR_VERSION "${CMAKE_HOST_SYSTEM_VERSION}")
+endif (CMAKE_UNAME)
+
+# Force the compilers to gcc for iOS
+set (CMAKE_C_COMPILER /usr/bin/gcc)
+set (CMAKE_CXX_COMPILER /usr/bin/g++)
+set(CMAKE_AR ar CACHE FILEPATH "" FORCE)
+set(CMAKE_RANLIB ranlib CACHE FILEPATH "" FORCE)
+set(PKG_CONFIG_EXECUTABLE pkg-config CACHE FILEPATH "" FORCE)
+
+# Setup iOS platform unless specified manually with IOS_PLATFORM
+if (NOT DEFINED IOS_PLATFORM)
+    set (IOS_PLATFORM "OS")
+endif (NOT DEFINED IOS_PLATFORM)
+set (IOS_PLATFORM ${IOS_PLATFORM} CACHE STRING "Type of iOS Platform")
+
+# Check the platform selection and setup for developer root
+if (${IOS_PLATFORM} STREQUAL "OS")
+    set (IOS_PLATFORM_LOCATION "iPhoneOS.platform")
+    set (XCODE_IOS_PLATFORM iphoneos)
+
+    # This causes the installers to properly locate the output libraries
+    set (CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphoneos")
+elseif (${IOS_PLATFORM} STREQUAL "SIMULATOR")
+    set (SIMULATOR true)
+    set (IOS_PLATFORM_LOCATION "iPhoneSimulator.platform")
+    set (XCODE_IOS_PLATFORM iphonesimulator)
+
+    # This causes the installers to properly locate the output libraries
+    set (CMAKE_XCODE_EFFECTIVE_PLATFORMS "-iphonesimulator")
+elseif (${IOS_PLATFORM} STREQUAL "WATCHOS")
+    set (IOS_PLATFORM_LOCATION "WatchOS.platform")
+    set (XCODE_IOS_PLATFORM watchos)
+
+    # This causes the installers to properly locate the output libraries
+    set (CMAKE_XCODE_EFFECTIVE_PLATFORMS "-watchos")
+else (${IOS_PLATFORM} STREQUAL "OS")
+    message (FATAL_ERROR
+             "Unsupported IOS_PLATFORM value selected. "
+             "Please choose OS, SIMULATOR, or WATCHOS.")
+endif ()
+
+# All iOS/Darwin specific settings - some may be redundant
+set (CMAKE_SHARED_LIBRARY_PREFIX "lib")
+set (CMAKE_SHARED_LIBRARY_SUFFIX ".dylib")
+set (CMAKE_SHARED_MODULE_PREFIX "lib")
+set (CMAKE_SHARED_MODULE_SUFFIX ".so")
+set (CMAKE_MODULE_EXISTS 1)
+set (CMAKE_DL_LIBS "")
+
+set (CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG "-compatibility_version ")
+set (CMAKE_C_OSX_CURRENT_VERSION_FLAG "-current_version ")
+set (CMAKE_CXX_OSX_COMPATIBILITY_VERSION_FLAG "${CMAKE_C_OSX_COMPATIBILITY_VERSION_FLAG}")
+set (CMAKE_CXX_OSX_CURRENT_VERSION_FLAG "${CMAKE_C_OSX_CURRENT_VERSION_FLAG}")
+
+if (IOS_DEPLOYMENT_TARGET)
+  set(XCODE_IOS_PLATFORM_VERSION_FLAGS "-m${XCODE_IOS_PLATFORM}-version-min=${IOS_DEPLOYMENT_TARGET}")
+endif()
+
+# Hidden visibilty is required for cxx on iOS 
+set (CMAKE_C_FLAGS_INIT "${XCODE_IOS_PLATFORM_VERSION_FLAGS}")
+set (CMAKE_CXX_FLAGS_INIT "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -fvisibility-inlines-hidden")
+
+set (CMAKE_C_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_C_LINK_FLAGS}")
+set (CMAKE_CXX_LINK_FLAGS "${XCODE_IOS_PLATFORM_VERSION_FLAGS} -Wl,-search_paths_first ${CMAKE_CXX_LINK_FLAGS}")
+
+set (CMAKE_PLATFORM_HAS_INSTALLNAME 1)
+set (CMAKE_SHARED_LIBRARY_CREATE_C_FLAGS "-dynamiclib -headerpad_max_install_names")
+set (CMAKE_SHARED_MODULE_CREATE_C_FLAGS "-bundle -headerpad_max_install_names")
+set (CMAKE_SHARED_MODULE_LOADER_C_FLAG "-Wl,-bundle_loader,")
+set (CMAKE_SHARED_MODULE_LOADER_CXX_FLAG "-Wl,-bundle_loader,")
+set (CMAKE_FIND_LIBRARY_SUFFIXES ".dylib" ".so" ".a")
+
+# hack: if a new cmake (which uses CMAKE_INSTALL_NAME_TOOL) runs on an old build tree
+# (where install_name_tool was hardcoded) and where CMAKE_INSTALL_NAME_TOOL isn't in the cache
+# and still cmake didn't fail in CMakeFindBinUtils.cmake (because it isn't rerun)
+# hardcode CMAKE_INSTALL_NAME_TOOL here to install_name_tool, so it behaves as it did before, Alex
+if (NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
+    find_program(CMAKE_INSTALL_NAME_TOOL install_name_tool)
+endif (NOT DEFINED CMAKE_INSTALL_NAME_TOOL)
+
+# Setup iOS deployment target
+set (IOS_DEPLOYMENT_TARGET ${IOS_DEPLOYMENT_TARGET} CACHE STRING "Minimum iOS version")
+
+# Setup iOS developer location unless specified manually with CMAKE_IOS_DEVELOPER_ROOT
+# Note Xcode 4.3 changed the installation location, choose the most recent one available
+exec_program(/usr/bin/xcode-select ARGS -print-path OUTPUT_VARIABLE CMAKE_XCODE_DEVELOPER_DIR)
+set (XCODE_POST_43_ROOT "${CMAKE_XCODE_DEVELOPER_DIR}/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
+set (XCODE_PRE_43_ROOT "/Developer/Platforms/${IOS_PLATFORM_LOCATION}/Developer")
+if (NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
+    if (EXISTS ${XCODE_POST_43_ROOT})
+        set (CMAKE_IOS_DEVELOPER_ROOT ${XCODE_POST_43_ROOT})
+    elseif(EXISTS ${XCODE_PRE_43_ROOT})
+        set (CMAKE_IOS_DEVELOPER_ROOT ${XCODE_PRE_43_ROOT})
+    endif (EXISTS ${XCODE_POST_43_ROOT})
+endif (NOT DEFINED CMAKE_IOS_DEVELOPER_ROOT)
+set (CMAKE_IOS_DEVELOPER_ROOT ${CMAKE_IOS_DEVELOPER_ROOT} CACHE PATH "Location of iOS Platform")
+
+# Find and use the most recent iOS sdk unless specified manually with CMAKE_IOS_SDK_ROOT
+if (NOT DEFINED CMAKE_IOS_SDK_ROOT)
+    file (GLOB _CMAKE_IOS_SDKS "${CMAKE_IOS_DEVELOPER_ROOT}/SDKs/*")
+    if (_CMAKE_IOS_SDKS) 
+        list (SORT _CMAKE_IOS_SDKS)
+        list (REVERSE _CMAKE_IOS_SDKS)
+        list (GET _CMAKE_IOS_SDKS 0 CMAKE_IOS_SDK_ROOT)
+    else (_CMAKE_IOS_SDKS)
+        message (FATAL_ERROR "No iOS SDK's found in default search path ${CMAKE_IOS_DEVELOPER_ROOT}. Manually set CMAKE_IOS_SDK_ROOT or install the iOS SDK.")
+    endif (_CMAKE_IOS_SDKS)
+    message (STATUS "Toolchain using default iOS SDK: ${CMAKE_IOS_SDK_ROOT}")
+endif (NOT DEFINED CMAKE_IOS_SDK_ROOT)
+set (CMAKE_IOS_SDK_ROOT ${CMAKE_IOS_SDK_ROOT} CACHE PATH "Location of the selected iOS SDK")
+
+# Set the sysroot default to the most recent SDK
+set (CMAKE_OSX_SYSROOT ${CMAKE_IOS_SDK_ROOT} CACHE PATH "Sysroot used for iOS support")
+
+# set the architecture for iOS 
+if (IOS_PLATFORM STREQUAL "OS")
+    set (IOS_ARCH "armv7;armv7s;arm64")
+elseif (IOS_PLATFORM STREQUAL "SIMULATOR")
+    set (IOS_ARCH "i386;x86_64")
+elseif (IOS_PLATFORM STREQUAL "WATCHOS")
+    set (IOS_ARCH "armv7k")
+endif ()
+
+set (CMAKE_OSX_ARCHITECTURES ${IOS_ARCH} CACHE string  "Build architecture for iOS")
+
+# Set the find root to the iOS developer roots and to user defined paths
+set (CMAKE_FIND_ROOT_PATH ${CMAKE_IOS_DEVELOPER_ROOT} ${CMAKE_IOS_SDK_ROOT} ${CMAKE_PREFIX_PATH} CACHE string  "iOS find search path root")
+
+# default to searching for frameworks first
+set (CMAKE_FIND_FRAMEWORK FIRST)
+
+# set up the default search directories for frameworks
+set (CMAKE_SYSTEM_FRAMEWORK_PATH
+    ${CMAKE_IOS_SDK_ROOT}/System/Library/Frameworks
+    ${CMAKE_IOS_SDK_ROOT}/System/Library/PrivateFrameworks
+    ${CMAKE_IOS_SDK_ROOT}/Developer/Library/Frameworks
+)
+
+# only search the iOS sdks, not the remainder of the host filesystem
+set (CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+set (CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+set (CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+
+# This little macro lets you set any XCode specific property
+macro (set_xcode_property TARGET XCODE_PROPERTY XCODE_VALUE)
+    set_property (TARGET ${TARGET} PROPERTY XCODE_ATTRIBUTE_${XCODE_PROPERTY} ${XCODE_VALUE})
+endmacro (set_xcode_property)
+
+# This macro lets you find executable programs on the host system
+macro (find_host_package)
+    set (CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+    set (CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
+    set (CMAKE_FIND_ROOT_PATH_MODE_INCLUDE NEVER)
+    set (IOS FALSE)
+
+    find_package(${ARGN})
+
+    set (IOS TRUE)
+    set (CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
+    set (CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+    set (CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endmacro (find_host_package)
diff --git a/cmake/external/python.cmake b/cmake/external/python.cmake
index 490c87d67ed79a238dd506127cd4d9855fab6626..53ef7cd29c19609905f6e66f973b8b70c2b58f00 100644
--- a/cmake/external/python.cmake
+++ b/cmake/external/python.cmake
@@ -15,9 +15,9 @@
 INCLUDE(ExternalProject)
 INCLUDE(python_module)
 
-FIND_PACKAGE(PythonInterp 2.7)
+FIND_HOST_PACKAGE(PythonInterp 2.7)
 IF(WITH_PYTHON)
-    FIND_PACKAGE(PythonLibs 2.7)
+    FIND_HOST_PACKAGE(PythonLibs 2.7)
     # Fixme: Maybe find a static library. Get SHARED/STATIC by FIND_PACKAGE.
     ADD_LIBRARY(python SHARED IMPORTED GLOBAL)
     SET_PROPERTY(TARGET python PROPERTY IMPORTED_LOCATION ${PYTHON_LIBRARIES})
@@ -29,7 +29,7 @@ IF(PYTHONINTERP_FOUND)
     find_python_module(numpy REQUIRED)
     find_python_module(wheel REQUIRED)
     find_python_module(google.protobuf REQUIRED)
-    FIND_PACKAGE(NumPy REQUIRED)
+    FIND_HOST_PACKAGE(NumPy REQUIRED)
     IF(${PY_GOOGLE.PROTOBUF_VERSION} AND ${PY_GOOGLE.PROTOBUF_VERSION} VERSION_LESS "3.0.0")
         MESSAGE(FATAL_ERROR "Found Python Protobuf ${PY_GOOGLE.PROTOBUF_VERSION} < 3.0.0, "
         "please use pip to upgrade protobuf. pip install -U protobuf")
diff --git a/cmake/system.cmake b/cmake/system.cmake
index adf5e2c539740076ad1808353522c7467d765e64..7462802d2141b649577049ba811a2da3ebc73ed2 100644
--- a/cmake/system.cmake
+++ b/cmake/system.cmake
@@ -82,6 +82,9 @@ IF(DEFINED CMAKE_SYSTEM_NAME)
     ELSEIF(${CMAKE_SYSTEM_NAME} STREQUAL "RPi")
         SET(RPI TRUE)
         INCLUDE(cross_compiling/raspberry_pi)
+    ELSEIF(${CMAKE_SYSTEM_NAME} STREQUAL "Darwin")
+        SET(IOS TRUE)
+        INCLUDE(cross_compiling/ios)
     ENDIF()
 ENDIF()
 
diff --git a/ios_run.sh b/ios_run.sh
new file mode 100644
index 0000000000000000000000000000000000000000..b8325f15fc393ff57b3e912d772dbd6f6fbce0c0
--- /dev/null
+++ b/ios_run.sh
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -xe
+
+mkdir -p ./ios_build
+cd ./ios_build
+
+cmake -DCMAKE_SYSTEM_NAME=Darwin \
+					   -DWITH_C_API=ON \
+					   -DWITH_TESTING=OFF \
+					   -DWITH_SWIG_PY=OFF \
+					   -DCMAKE_BUILD_TYPE=Release \
+					   -DCMAKE_INSTALL_PREFIX=/Users/xingzhaolong/cross_compile/ios \
+					   ..
+                      # -DIOS_PLATFORM=SIMULATOR \
+                       #-DCMAKE_Go_COMPILER=/usr/local/bin \
+