diff --git a/ra-tls/README.md b/ra-tls/README.md
index d0ac4a1b1ca4ade1727196a741770c0db25861f8..323190a8d9bfbb5efad1c4d1978b35bd0cc9a224 100644
--- a/ra-tls/README.md
+++ b/ra-tls/README.md
@@ -1,95 +1,49 @@
-# Before you start
-- Refer to [this guide](https://github.com/alibaba/inclavare-containers#rune) to build `rune` from scratch.
-- Register a `SPID` and `Subscription Key` of [IAS](https://api.portal.trustedservices.intel.com/EPID-attestation). After the registration, Intel will respond with a SPID which is needed to communicate with IAS.
-
-# Run stub with Docker
-## Configure SGX RA settings
-```shell
+# Configure SGX RA settings
+``` shell
 export SPID=<hex string>
 export EPID_SUBSCRIPTION_KEY=<hex string>
 export QUOTE_TYPE=<SGX_LINKABLE_SIGNATURE | SGX_UNLINKABLE_SIGNATURE>
 ```
 
-## Install dependency
-```shell
-yum install -y patch autoconf automake libtool
+# Build Stub Enclave
+``` shell
+cd "${path_to_inclavare_containers}/stub-enclave"
+make
+sudo make install
 ```
 
-## Build liberpal-stub
-```shell
-cd "${path_to_inclavare_containers}/ra-tls"
-make
-cp pal/liberpal-stub.so /usr/lib
+# Build Docker images
+## Prepare the materials
+``` shell
+mkdir lib
+cp /usr/lib/x86_64-linux-gnu/libsgx_urts.so lib
+cp /usr/lib/x86_64-linux-gnu/libsgx_uae_service.so lib
+cp /usr/lib/x86_64-linux-gnu/libsgx_enclave_common.so.1 lib
+cp /usr/lib/x86_64-linux-gnu/libprotobuf.so.10 lib
+cp /lib/x86_64-linux-gnu/libseccomp.so.2 lib
 ```
 
-# Build stub container image
-```shell
-cd "${path_to_inclavare_containers}/ra-tls/stub-enclave"
-cat >Dockerfile <<EOF
+## Dockerfile
+``` shell
 FROM ubuntu:18.04
   
 RUN mkdir -p /run/rune/stub-enclave
 WORKDIR /run/rune
 
+COPY lib                        /lib
+COPY liberpal-stub.so         .
 COPY Wolfssl_Enclave.signed.so  stub-enclave
-EOF
-docker build -t stub-enclave .
-```
-
-# Run stub container image with rune
-## Configure OCI runtime
-Refer to [this guide](https://github.com/alibaba/inclavare-containers/blob/master/rune/libenclave/internal/runtime/pal/skeleton/README.md#configure-oci-runtime) to configure OCI runtime in dockerd config file.
-
-## Run stub container image with rune
-```shell
-docker run -it --rm --runtime=rune -e ENCLAVE_TYPE=intelSgx \
-	-e ENCLAVE_RUNTIME_PATH=/usr/lib/liberpal-stub.so \
-	-e ENCLAVE_RUNTIME_ARGS=stub-enclave stub-enclave
-```
-
-# Run stub OCI bundle
-## Create stub bundle
-In order to use `rune` you must have your container image in the format of an OCI bundle. If you have Docker installed you can use its `export` method to acquire a root filesystem from an existing stub-enclave Docker container image.
 
-```shell
-# create the top most bundle directory
-cd "$HOME/rune_workdir"
-mkdir rune-container
-cd rune-container
-
-# create the rootfs directory
-mkdir rootfs
-
-# export stub-enclave image via Docker into the rootfs directory
-docker export $(docker create stub-enclave) | sudo tar -C rootfs -xvf -
+RUN ldconfig
 ```
 
-After a root filesystem is populated you just generate a spec in the format of a config.json file inside your bundle. `rune` provides a spec command which is similar to `runc` to generate a template file that you are then able to edit.
-
-```shell
-rune spec
+``` shell
+docker build -t ${stub-enclave-image} .
 ```
 
-To find features and documentation for fields in the spec please refer to the [specs](https://github.com/opencontainers/runtime-spec) repository.
-
-In order to run the stub-enclave bundle with `rune`, you need to configure enclave runtime as following:
-```json
-  "annotations": {
-      "enclave.type": "intelSgx",
-      "enclave.runtime.path": "/usr/lib/liberpal-stub.so",
-      "enclave.runtime.args": "stub-enclave"
-  }
-```
-
-where:
-- @enclave.type: specify the type of enclave hardware to use, such as intelSgx.
-- @enclave.runtime.path: specify the path to enclave runtime to launch.
-- @enclave.runtime.args: specify the specific arguments to enclave runtime, seperated by the comma.
-
-## Run stub
-Assuming you have an OCI bundle from the previous step you can execute the container in this way.
-
-```shell
-cd "$HOME/rune_workdir/rune-container"
-sudo rune run stub-enclave-container
+# run stub-enclave images with rune
+``` shell
+docker run -it --rm --runtime=rune -e ENCLAVE_TYPE=intelSgx \
+	-e ENCLAVE_RUNTIME_PATH=/lib/liberpal-stub.so \
+	-e ENCLAVE_RUNTIME_ARGS=stub-enclave ${stub-enclave-image}
 ```