diff --git a/tools/document_preview.sh b/tools/document_preview.sh
index 83c758d0aa8b8faf35a21fe8b8b794745669b147..424169bbc512798c66c9422f1f92bf243caaae57 100755
--- a/tools/document_preview.sh
+++ b/tools/document_preview.sh
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-# Copyright (c) 2021 PaddlePaddle Authors. All Rights Reserved.
+# Copyright (c) 2022 PaddlePaddle Authors. All Rights Reserved.
 # 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -14,19 +14,155 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-PADDLE_ROOT=/home
-mkdir ${PADDLE_ROOT}
-cd ${PADDLE_ROOT}
-pip install /paddle/build/opt/paddle/share/wheels/*.whl
-git clone https://github.com/PaddlePaddle/FluidDoc
-git clone https://github.com/tianshuo78520a/PaddlePaddle.org.git
-cd  ${PADDLE_ROOT}/PaddlePaddle.org
-git reset 3feaa68376d8423e41d076814e901e6bf108c705
-cd ${PADDLE_ROOT}/FluidDoc/doc/fluid/api
-sh gen_doc.sh
-apt-get update && apt-get install -y python-dev build-essential
-cd ${PADDLE_ROOT}/PaddlePaddle.org/portal
-pip install -r requirements.txt
-#If the default port is not occupied, you can use port 8000, you need to replace it with a random port on the CI.
-sed -i "s#8000#$1#g" runserver
-nohup ./runserver --paddle ${PADDLE_ROOT}/FluidDoc &
+is_shell_attribute_set() { # attribute, like "x"
+  case "$-" in
+    *"$1"*) return 0 ;;
+    *)    return 1 ;;
+  esac
+}
+function get_docs_pr_num_from_paddle_pr_info(){
+    # get_repo_pr_info's output
+    pr_info_file=$1
+    if [ ! -r ${pr_info_file} ] ; then
+        return 1
+    fi
+
+    declare -A arr_kv
+    while read line
+    do
+        echo "$line" | grep '^\w\+\s*=\s*.*' > /dev/null
+        if [ $? = 0 ] ; then
+            kv=($(echo $line | sed 's/=/\n/g'))
+            k=($(echo "${kv[0]}" | sed 's/\s//g'))
+            v=($(echo "${kv[1]}" | sed 's/^\s*//g' | sed 's/\s*$//g'))
+            # arr_kv[${kv[1]}]=${kv[2]}
+            arr_kv[${k}]=${v}
+        fi
+    done < <(jq -r '.body' ${pr_info_file})
+
+    echo ${arr_kv[PADDLEDOCS_PR]}
+    return 0
+}
+
+# Attention:
+# 1. /FluidDoc will be used as the workspace of PaddlePaddle/docs. 
+# 2. And /docs is used as the output of doc-build process.
+# 3. If conflicted with yours, please modify the defination of FLUIDDOCDIR and
+#    OUTPUTDIR in the subsequent codes.
+# 4. The doc-build process is controlled under EnvVar BUILD_DOC and UPLOAD_DOC.
+#    All the Chinese and English docs will be generated, and then uploaded.
+
+PREVIEW_URL_PROMPT="ipipe_log_param_preview_url: None"
+BUILD_DOC=${BUILD_DOC:=false}
+UPLOAD_DOC=${UPLOAD_DOC:=false}
+
+CURPWD=${PWD}
+
+if [ -f /usr/local/python3.7.0/bin/sphinx-build ] ; then
+    if [ -f /usr/local/bin/sphinx-build ] ; then
+        rm /usr/local/bin/sphinx-build
+    fi
+    ln -s /usr/local/python3.7.0/bin/sphinx-build /usr/local/bin/sphinx-build
+fi
+
+if [ "${BUILD_DOC}" = "true" ] &&  [ -x /usr/local/bin/sphinx-build ] ; then
+    export FLUIDDOCDIR=${FLUIDDOCDIR:=/FluidDoc}
+    export OUTPUTDIR=${OUTPUTDIR:=/docs}
+    export VERSIONSTR=$(echo ${BRANCH} | sed 's@release/@@g')
+
+    if [ -d ${FLUIDDOCDIR} ] ; then
+        echo "${FLUIDDOCDIR} exists, git clone will be skipped, but git clean will be done."
+        cd ${FLUIDDOCDIR}
+        git reset --hard
+        git clean -dfx
+        cd ${CURPWD}
+    else
+        git clone -b ${BRANCH} --depth=1 https://github.com/PaddlePaddle/docs.git ${FLUIDDOCDIR}
+        if [ ! "$?" = "0" ] ; then
+            git clone --depth=1 https://github.com/PaddlePaddle/docs.git ${FLUIDDOCDIR}
+        fi
+    fi
+    if [ -d ${OUTPUTDIR} ] ; then
+        echo "$0: rm -rf ${OUTPUTDIR}"
+        rm -rf ${OUTPUTDIR}
+        mkdir -p ${OUTPUTDIR}
+    fi
+
+    # install requirements
+    export no_proxy=mirror.baidu.com,${no_proxy}
+    apt-get install -y --no-install-recommends doxygen jq
+    echo 'beautifulsoup4
+Markdown
+sphinx-sitemap
+sphinx-markdown-tables
+breathe
+exhale
+sphinx_design
+nbsphinx
+' >/tmp/doc-build.requirements && \
+    pip install --no-cache-dir -i https://mirror.baidu.com/pypi/simple -r /tmp/doc-build.requirements && \
+    rm /tmp/doc-build.requirements
+
+
+    source ${FLUIDDOCDIR}/ci_scripts/utils.sh
+    paddle_pr_info=$(get_repo_pr_info "PaddlePaddle/Paddle" ${GIT_PR_ID})
+    docs_pr_id=$(get_docs_pr_num_from_paddle_pr_info ${paddle_pr_info})
+    if [ -n "${docs_pr_id}" ] ; then
+        cd ${FLUIDDOCDIR}
+        git fetch --depth=1 origin pull/${docs_pr_id}/head
+        git checkout -b "pr${docs_pr_id}" FETCH_HEAD
+        git log --pretty=oneline -10
+    fi
+    echo "docs_pr_id=${docs_pr_id}"
+
+
+    # build doc
+    /bin/bash -x ${FLUIDDOCDIR}/ci_scripts/gendoc.sh
+    if [ $? -ne 0 ];then
+        echo 'gendoc error'
+        exit 1
+    fi
+
+    if [ "${UPLOAD_DOC}" = "true" ] ; then
+        curl -o /tmp/linux-bcecmd-0.3.0.zip https://sdk.bce.baidu.com/console-sdk/linux-bcecmd-0.3.0.zip && \
+        python -m zipfile -e /tmp/linux-bcecmd-0.3.0.zip /opt && \
+        chmod +x /opt/linux-bcecmd-0.3.0/bcecmd && \
+        rm /tmp/linux-bcecmd-0.3.0.zip && \
+        curl -o /tmp/boscmdconfig.tgz https://paddle-dev-tools-open.bj.bcebos.com/fluiddoc-preview/boscmdconfig.tgz && \
+        tar xzf /tmp/boscmdconfig.tgz -C /opt/linux-bcecmd-0.3.0/ && \
+        rm /tmp/boscmdconfig.tgz
+
+        # credentials file is empty, please build it if need.
+        BCECMD=/opt/linux-bcecmd-0.3.0/bcecmd
+        BCECMD_CONFIG=/opt/linux-bcecmd-0.3.0/boscmdconfig
+
+        is_shell_attribute_set x
+        xdebug_setted=$?
+        if [ $xdebug_setted ] ; then
+            set +x
+        fi
+        if [ -n "${BOS_CREDENTIAL_AK}" ] && [ -n "${BOS_CREDENTIAL_SK}" ] ; then
+            echo "Ak = ${BOS_CREDENTIAL_AK}" >> ${BCECMD_CONFIG}/credentials
+            echo "Sk = ${BOS_CREDENTIAL_SK}" >> ${BCECMD_CONFIG}/credentials
+        fi
+        if [ $xdebug_setted ] ; then
+            set -x
+        fi
+
+        PREVIEW_JOB_NAME="preview-paddle-pr-${GIT_PR_ID}"
+        BOSBUCKET=${BOSBUCKET:=paddle-site-web-dev}
+        ${BCECMD} --conf-path ${BCECMD_CONFIG} bos sync "${OUTPUTDIR}/en/${VERSIONSTR}" "bos:/${BOSBUCKET}/documentation/en/${PREVIEW_JOB_NAME}" \
+            --delete --yes --exclude "${OUTPUTDIR}/en/${VERSIONSTR}/_sources/"
+        ${BCECMD} --conf-path ${BCECMD_CONFIG} bos sync "${OUTPUTDIR}/en/${VERSIONSTR}" "bos:/${BOSBUCKET}/documentation/en/${PREVIEW_JOB_NAME}" \
+            --delete --yes --exclude "${OUTPUTDIR}/en/${VERSIONSTR}/_sources/"
+        ${BCECMD} --conf-path ${BCECMD_CONFIG} bos sync "${OUTPUTDIR}/zh/${VERSIONSTR}" "bos:/${BOSBUCKET}/documentation/zh/${PREVIEW_JOB_NAME}" \
+            --delete --yes --exclude "${OUTPUTDIR}/zh/${VERSIONSTR}/_sources/"
+        ${BCECMD} --conf-path ${BCECMD_CONFIG} bos sync "${OUTPUTDIR}/zh/${VERSIONSTR}" "bos:/${BOSBUCKET}/documentation/zh/${PREVIEW_JOB_NAME}" \
+            --delete --yes --exclude "${OUTPUTDIR}/zh/${VERSIONSTR}/_sources/"
+        PREVIEW_URL_PROMPT="ipipe_log_param_preview_url: http://${PREVIEW_JOB_NAME}.${PREVIEW_SITE:-paddle.run}/documentation/docs/zh/api/index_cn.html"
+    fi
+fi
+
+cd ${CURPWD}
+# print the preview url
+echo "${PREVIEW_URL_PROMPT}"
diff --git a/tools/sampcd_processor.py b/tools/sampcd_processor.py
index d8cb70c9dd107b076648bd7ae032bd7f3db573df..2d8692c5bc7e5c7389af5b07afebbc6de7d96ced 100644
--- a/tools/sampcd_processor.py
+++ b/tools/sampcd_processor.py
@@ -550,6 +550,42 @@ def get_incrementapi():
                 f.write('\n')
 
 
+def exec_gen_doc():
+    result = True
+    cmd = ["bash", "document_preview.sh"]
+    logger.info("----exec gen_doc----")
+    start_time = time.time()
+    subprc = subprocess.Popen(
+        cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+    output, error = subprc.communicate()
+    msg = "".join(output.decode(encoding='utf-8'))
+    err = "".join(error.decode(encoding='utf-8'))
+    end_time = time.time()
+
+    if subprc.returncode != 0:
+        logger.info("----gen_doc msg----")
+        logger.info(msg)
+        logger.error("----gen_doc error msg----")
+        logger.error(err)
+        logger.error("----exec gen_doc failed----")
+        result = False
+    else:
+        logger.info("----gen_doc msg----")
+        logger.info(msg)
+        logger.info("----exec gen_doc success----")
+
+    for fn in [
+            '/docs/en/develop/index_en.html', '/docs/zh/develop/index_cn.html'
+    ]:
+        if os.path.exists(fn):
+            logger.info('%s exists.', fn)
+        else:
+            logger.error('%s not exists.', fn)
+
+    # msg is the returned code execution report
+    return result, msg, end_time - start_time
+
+
 arguments = [
     # flags, dest, type, default, help
     ['--gpu_id', 'gpu_id', int, 0, 'GPU device id to use [0]'],
@@ -570,6 +606,11 @@ def parse_args():
     parser.add_argument('--debug', dest='debug', action="store_true")
     parser.add_argument('--full-test', dest='full_test', action="store_true")
     parser.add_argument('mode', type=str, help='run on device', default='cpu')
+    parser.add_argument(
+        '--build-doc',
+        dest='build_doc',
+        action='store_true',
+        help='build doc if need.')
     for item in arguments:
         parser.add_argument(
             item[0], dest=item[1], help=item[4], type=item[2], default=item[3])
@@ -702,3 +743,7 @@ if __name__ == '__main__':
             exit(1)
 
     logger.info("Sample code check is successful!")
+
+    if args.mode == "cpu":
+        # As cpu mode is also run with the GPU whl, so skip it in gpu mode.
+        exec_gen_doc()