diff --git a/.github/workflows/demo_test.yml b/.github/workflows/demo_test.yml
index ed9b3876..5e761004 100644
--- a/.github/workflows/demo_test.yml
+++ b/.github/workflows/demo_test.yml
@@ -595,7 +595,7 @@ jobs:
       run: |
         sleep ${{ env.nap_time }};
         docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/golang/vault && ./run_occlum_vault_test.sh"
-  
+
   sofaboot_test:
     runs-on: ubuntu-20.04
     steps:
@@ -662,7 +662,6 @@ jobs:
       run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/sysbench/occlum_instance;
             occlum run /bin/sysbench threads --threads=200 --thread-yields=100 --thread-locks=4 --time=30 run"
 
-
   Gvisor_syscalls_test:
     runs-on: ubuntu-20.04
     steps:
@@ -768,4 +767,22 @@ jobs:
 
     - name: Run the LTP demo
       run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/linux-ltp/ltp_instance;
-            occlum run /opt/ltp/run-ltp.sh -f syscalls-occlum"
\ No newline at end of file
+            occlum run /opt/ltp/run-ltp.sh -f syscalls-occlum"
+
+  FIO_test:
+    runs-on: ubuntu-20.04
+    steps:
+    - uses: actions/checkout@v1
+      with:
+        submodules: true
+
+    - uses: ./.github/workflows/composite_action/sim
+      with:
+        container-name: ${{ github.job }}
+        build-envs: 'OCCLUM_RELEASE_BUILD=1'
+
+    - name: Build fio dependencies
+      run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/fio && ./download_and_build_fio.sh"
+
+    - name: Run fio test
+      run: docker exec ${{ github.job }} bash -c "cd /root/occlum/demos/fio && SGX_MODE=SIM ./run_fio_on_occlum.sh fio-seq-read.fio"
diff --git a/demos/README.md b/demos/README.md
index 31617eeb..5919eeef 100644
--- a/demos/README.md
+++ b/demos/README.md
@@ -16,6 +16,7 @@ This set of demos shows how real-world apps can be easily run inside SGX enclave
 
 * [bash](bash/): A demo of [Bash](https://www.gnu.org/software/bash/) shell script.
 * [cluster_serving](cluster_serving/): A demo of [Analytics Zoo Cluster Serving](https://analytics-zoo.github.io/master/#ClusterServingGuide/ProgrammingGuide/) inference solution.
+* [fio](fio/): A demo of [Flexible I/O Tester](https://github.com/axboe/fio).
 * [fish](fish/): A demo of [FISH](https://fishshell.com) shell script.
 * [flink](flink/): A demo of [Apache Flink](https://flink.apache.org).
 * [font](font/font_support_for_java): A demo of supporting font with Java.
diff --git a/demos/fio/.gitignore b/demos/fio/.gitignore
new file mode 100644
index 00000000..795496e8
--- /dev/null
+++ b/demos/fio/.gitignore
@@ -0,0 +1,2 @@
+fio_src/
+occlum_instance/
diff --git a/demos/fio/README.md b/demos/fio/README.md
new file mode 100644
index 00000000..add21e87
--- /dev/null
+++ b/demos/fio/README.md
@@ -0,0 +1,16 @@
+# Use Flexible I/O Tester in SGX with Occlum
+
+This project demonstrates how Occlum enables the [Flexible I/O Tester(FIO)](https://github.com/axboe/fio) in SGX enclaves.
+
+Step 1: Download and build the FIO
+```
+./download_and_build_fio.sh
+```
+When completed, the FIO program is generated in the source directory of it.
+
+Step 2: Run the FIO program to test sequential read inside SGX enclave with Occlum
+```
+./run_fio_on_occlum.sh fio-seq-read.fio
+```
+
+FIO uses a configuration file to run the I/O test. We have already copied and modified some configuration files from the `examples` directory of it. Please see the files in the [configs](configs/) for the detail.
diff --git a/demos/fio/configs/fio-rand-read.fio b/demos/fio/configs/fio-rand-read.fio
new file mode 100644
index 00000000..7bc8ebf7
--- /dev/null
+++ b/demos/fio/configs/fio-rand-read.fio
@@ -0,0 +1,16 @@
+; fio-rand-read.job for fiotest
+
+[global]
+name=fio-rand-read
+filename=/root/fio-rand-read
+rw=randread
+bs=4K
+direct=0
+numjobs=1
+time_based
+runtime=100
+
+[file1]
+size=256M
+ioengine=sync
+iodepth=16
diff --git a/demos/fio/configs/fio-rand-write.fio b/demos/fio/configs/fio-rand-write.fio
new file mode 100644
index 00000000..e1abcee8
--- /dev/null
+++ b/demos/fio/configs/fio-rand-write.fio
@@ -0,0 +1,16 @@
+; fio-rand-write.job for fiotest
+
+[global]
+name=fio-rand-write
+filename=/root/fio-rand-write
+rw=randwrite
+bs=4K
+direct=0
+numjobs=1
+time_based
+runtime=100
+
+[file1]
+size=256M
+ioengine=sync
+iodepth=16
diff --git a/demos/fio/configs/fio-seq-read.fio b/demos/fio/configs/fio-seq-read.fio
new file mode 100644
index 00000000..de15ce1a
--- /dev/null
+++ b/demos/fio/configs/fio-seq-read.fio
@@ -0,0 +1,14 @@
+[global]
+name=fio-seq-read
+filename=/root/fio-seq-read
+rw=read
+bs=256K
+direct=1
+numjobs=1
+time_based
+runtime=100
+
+[file1]
+size=256M
+ioengine=sync
+iodepth=16
diff --git a/demos/fio/configs/fio-seq-write.fio b/demos/fio/configs/fio-seq-write.fio
new file mode 100644
index 00000000..3838f3b2
--- /dev/null
+++ b/demos/fio/configs/fio-seq-write.fio
@@ -0,0 +1,16 @@
+; fio-seq-write.job for fiotest
+
+[global]
+name=fio-seq-write
+filename=/root/fio-seq-write
+rw=write
+bs=256K
+direct=0
+numjobs=1
+time_based
+runtime=100
+
+[file1]
+size=256M
+ioengine=sync
+iodepth=16
diff --git a/demos/fio/disable-fadvise.diff b/demos/fio/disable-fadvise.diff
new file mode 100644
index 00000000..cd617382
--- /dev/null
+++ b/demos/fio/disable-fadvise.diff
@@ -0,0 +1,13 @@
+diff --git a/configure b/configure
+index 84ccce04..ba205c92 100755
+--- a/configure
++++ b/configure
+@@ -1068,7 +1068,7 @@ int main(int argc, char **argv)
+ }
+ EOF
+ if compile_prog "" "" "posix_fadvise"; then
+-    posix_fadvise="yes"
++    posix_fadvise="no"
+ fi
+ print_config "POSIX fadvise" "$posix_fadvise"
+ 
diff --git a/demos/fio/download_and_build_fio.sh b/demos/fio/download_and_build_fio.sh
new file mode 100755
index 00000000..2fef878b
--- /dev/null
+++ b/demos/fio/download_and_build_fio.sh
@@ -0,0 +1,21 @@
+#!/bin/bash
+set -e
+
+SRC=fio_src
+
+# Download FIO
+if [ ! -d $SRC ];then
+    rm -rf $SRC && mkdir $SRC
+    cd $SRC
+    git clone https://github.com/axboe/fio.git .
+    git checkout tags/fio-3.28
+    git apply ../disable-fadvise.diff
+else
+    cd $SRC
+fi
+
+# Build FIO
+./configure --disable-shm --cc=occlum-gcc
+make
+
+echo "Build FIO success!"
diff --git a/demos/fio/fio.yaml b/demos/fio/fio.yaml
new file mode 100644
index 00000000..880f4f7c
--- /dev/null
+++ b/demos/fio/fio.yaml
@@ -0,0 +1,14 @@
+includes:
+  - base.yaml
+# fio
+targets:
+  # copy bins
+  - target: /bin
+    copy:
+      - files:
+        - ../fio_src/fio
+  # copy config files
+  - target: /
+    copy:
+      - dirs:
+        - ../configs
diff --git a/demos/fio/run_fio_on_occlum.sh b/demos/fio/run_fio_on_occlum.sh
new file mode 100755
index 00000000..a6d36631
--- /dev/null
+++ b/demos/fio/run_fio_on_occlum.sh
@@ -0,0 +1,40 @@
+#!/bin/bash
+set -e
+
+GREEN='\033[1;32m'
+NC='\033[0m'
+
+SCRIPT_DIR=$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )
+bomfile=${SCRIPT_DIR}/fio.yaml
+
+FIO=fio
+FIO_CONFIG=$1
+
+if [ ! -e ${SCRIPT_DIR}/fio_src/${FIO} ];then
+    echo "Error: cannot stat '${FIO} in fio_src'"
+    echo "Please see README and build the ${FIO}"
+    exit 1
+fi
+
+if [ ! -e ${SCRIPT_DIR}/configs/${FIO_CONFIG} ]  || [ -z ${FIO_CONFIG} ];then
+    echo "Error: cannot stat '${FIO_CONFIG}' in configs"
+    echo "Please copy it into configs first"
+    exit 1
+fi
+
+# 1. Init Occlum instance
+rm -rf occlum_instance && occlum new occlum_instance
+cd occlum_instance
+TCS_NUM=$(($(nproc) * 2))
+new_json="$(jq --argjson THREAD_NUM ${TCS_NUM} '.resource_limits.max_num_of_threads = $THREAD_NUM ' Occlum.json)" && \
+echo "${new_json}" > Occlum.json
+
+# 2. Copy files into Occlum instance and build
+rm -rf image
+copy_bom -f $bomfile --root image --include-dir /opt/occlum/etc/template
+
+occlum build
+
+# 3. Run the program
+echo -e "${GREEN}occlum run /bin/${FIO} /configs/${FIO_CONFIG}${NC}"
+occlum run /bin/${FIO} "/configs/${FIO_CONFIG}"