diff --git a/buffered.go b/MPI/buffered.go
similarity index 100%
rename from buffered.go
rename to MPI/buffered.go
diff --git a/cart.go b/MPI/cart.go
similarity index 100%
rename from cart.go
rename to MPI/cart.go
diff --git a/comm.go b/MPI/comm.go
similarity index 100%
rename from comm.go
rename to MPI/comm.go
diff --git a/const-helper.h b/MPI/const-helper.h
similarity index 100%
rename from const-helper.h
rename to MPI/const-helper.h
diff --git a/const.go b/MPI/const.go
similarity index 100%
rename from const.go
rename to MPI/const.go
diff --git a/datatype-helper.h b/MPI/datatype-helper.h
similarity index 100%
rename from datatype-helper.h
rename to MPI/datatype-helper.h
diff --git a/datatype.go b/MPI/datatype.go
similarity index 100%
rename from datatype.go
rename to MPI/datatype.go
diff --git a/error.go b/MPI/error.go
similarity index 100%
rename from error.go
rename to MPI/error.go
diff --git a/error_openmpi.go b/MPI/error_openmpi.go
similarity index 100%
rename from error_openmpi.go
rename to MPI/error_openmpi.go
diff --git a/file.go b/MPI/file.go
similarity index 100%
rename from file.go
rename to MPI/file.go
diff --git a/go-helper.go b/MPI/go-helper.go
similarity index 100%
rename from go-helper.go
rename to MPI/go-helper.go
diff --git a/go-helper_test.go b/MPI/go-helper_test.go
similarity index 100%
rename from go-helper_test.go
rename to MPI/go-helper_test.go
diff --git a/group.go b/MPI/group.go
similarity index 100%
rename from group.go
rename to MPI/group.go
diff --git a/info.go b/MPI/info.go
similarity index 100%
rename from info.go
rename to MPI/info.go
diff --git a/init.go b/MPI/init.go
similarity index 78%
rename from init.go
rename to MPI/init.go
index aa7702a..ae63e58 100644
--- a/init.go
+++ b/MPI/init.go
@@ -47,6 +47,29 @@ func Init(argv *[]string) int {
 	return int(err)
 }
 
+//Init
+//Initialize MPI on different thread levels
+func Init_thread(argv *[]string, required int) (int, int) {
+
+	argc := len(*argv)
+	c_argc := C.int(argc)
+
+	c_argv := make([]*C.char, argc)
+	for index, value := range *argv {
+		c_argv[index] = C.CString(value)
+		defer C.free(unsafe.Pointer(c_argv[index]))
+	}
+
+	var provided int
+	err := C.MPI_Init_thread(&c_argc, (***C.char)(unsafe.Pointer(&c_argv)), C.int(required), (*C.int)(unsafe.Pointer(&provided)))
+	goargs := make([]string, c_argc)
+	for i := 0; i < int(c_argc); i++ {
+		goargs[i] = C.GoString(c_argv[i])
+	}
+	*argv = goargs
+	return provided, int(err)
+}
+
 //Initialized
 //Indicates whether MPI_Init has been called.
 func Initialized(flag *int) int {
diff --git a/mem.go b/MPI/mem.go
similarity index 100%
rename from mem.go
rename to MPI/mem.go
diff --git a/misc.go b/MPI/misc.go
similarity index 100%
rename from misc.go
rename to MPI/misc.go
diff --git a/net.go b/MPI/net.go
similarity index 100%
rename from net.go
rename to MPI/net.go
diff --git a/operations-helper.h b/MPI/operations-helper.h
similarity index 100%
rename from operations-helper.h
rename to MPI/operations-helper.h
diff --git a/operations.go b/MPI/operations.go
similarity index 100%
rename from operations.go
rename to MPI/operations.go
diff --git a/tests.go b/MPI/tests.go
similarity index 100%
rename from tests.go
rename to MPI/tests.go
diff --git a/topo.go b/MPI/topo.go
similarity index 100%
rename from topo.go
rename to MPI/topo.go
diff --git a/type.go b/MPI/type.go
similarity index 100%
rename from type.go
rename to MPI/type.go
diff --git a/win.go b/MPI/win.go
similarity index 100%
rename from win.go
rename to MPI/win.go
diff --git a/README.md b/README.md
index bd13723..c71a02f 100644
--- a/README.md
+++ b/README.md
@@ -7,37 +7,30 @@ go-mpi are GO bindings for the Message Passing Interface <a href=http://www.mpi-
 MPI is a standard but the different implementations differ in some details.
 At the moment go-mpi support  <a href=http://www.open-mpi.de/>Open MPI</a> and <a href=http://www.mpich.org/>MPICH</a> version 2.
 
-To tell go where to look for the MPI library use the CGO_LDFALG environment variable. The following instructions uses the default path for Open MPI and MPICH.
-
-For Open MPI:
-```sh
-export CGO_LDFLAGS='-L/usr/lib/openmpi -lmpi'
-go get -tags openmpi github.com/JohannWeging/go-mpi
-```
-
-For MPICH:
-```sh
-export CGO_LDFLAGS='-L/usr/lib/ -lmpich'
-go get -tags mpich github.com/JohannWeging/go-mpi
-```
+To tell go where to look for mpi.h and mpi library, use the CGO_CFLAGS and CGO_LDFALG environment variable to indicate respectively. You can find paths of mpi.h and mpi library through command:
+
+	$ mpichversion
+
+
+Assume mpi.h dir is "/usr/local/include", mpi library dir is "/usr/local/lib", you could compile go-mpi/MPI like the following:
+
+	export CGO_CFLAGS='-I/usr/local/include'
+	export CGO_LDFLAGS='-L/usr/local/lib -lmpich'
+	go install go-mpi/MPI
+
+
 ## Syntax
 
-The syntax is similar to the C syntax of MPI.
-```
-<package_name>.Mpi_function(arguments)
-```
+Firstly you should import "go-mpi/MPI" in your go-mpi application.
+
+	import "go-mpi/MPI"
+
 
-If the bindings are imported as "MPI":
-<pre>
-  err = MPI.Init(os.Args)
-</pre>
+The syntax of MPI invokes in go-mpi is similar to it in C-binding MPI implementations.
 
-Output parameter like request objects are returned by the function and not passed as pointers inside the arguments.
+	<package_name>.Mpi_function(arguments)
 
-<pre>
-  C:
-  err = MPI_Irecv(recvBuffer, count, MPI_INT, 0, 1, MPI_COMM_WROLD, &request)
+For example:
 
-  GO:
-  err = MPI.Irecv(recvBuffer, count, MPI.INT, 0, 1, MPI.COMM_WORLD, &request)
-</pre>
+	err = MPI.Init(&os.Args)
+	err = MPI.Irecv(recvBuffer, count, MPI.INT, 0, 1, MPI.COMM_WORLD, &request)