diff --git a/Docs/S2311/Dockerfile b/Docs/S2311/Dockerfile
new file mode 100644
index 0000000..a9a06c1
--- /dev/null
+++ b/Docs/S2311/Dockerfile
@@ -0,0 +1,24 @@
+FROM milkvtech/milkv-duo:latest
+
+RUN echo "Asia/Shanghai" >/etc/timezone
+
+RUN apt update && \
+	apt upgrade -y && \
+	apt install -y \
+		tmux \
+		zsh \
+		zsh-autosuggestions \
+		zsh-syntax-highlighting \
+		locales && \
+	apt clean all && \
+	apt autoremove && \
+	locale-gen en_US.UTF-8
+
+ENV TERM=xterm-256color
+ENV LANG=en_US.UTF-8
+
+RUN  mkdir -p /home/worker
+COPY dot-zshrc /root/.zshrc
+
+WORKDIR /home/worker
+CMD ["/bin/zsh", "-l"]
diff --git a/Docs/S2311/README.md b/Docs/S2311/README.md
new file mode 100644
index 0000000..df2ddfc
--- /dev/null
+++ b/Docs/S2311/README.md
@@ -0,0 +1,53 @@
+# S2311: Baby LLaMA 2 on Duo 速度优化（儿童讲故事场景）
+
+## 赛题演示文档
+
+[S2311.PDF](./S2311.PDF)
+
+## 赛题演示回放地址
+
+TBA
+
+## 赛题演示中一些材料
+
+- scp2duo 函数
+  ```bash
+  scp2duo() {
+      local DUO_IP="${DUO_IP:-192.168.88.104}"
+      local D NEXT_IS_D=0
+      local -a S
+      for arg {
+          case $arg in
+              -d)
+                  NEXT_IS_D=1
+                  ;;
+              *)
+                  if [[ $NEXT_IS_D == 1 ]]; then
+                      D="$arg"
+                      NEXT_IS_D=0
+                  else
+                      S+=("$arg")
+                  fi
+                  ;;
+          esac
+      }
+      : ${D:="~/"}
+      set -- scp -O "${S[@]}" root@${DUO_IP}:"$D"
+      echo ">>>" "$@" >&2
+      "$@"
+  }
+  ```
+- resizefs.sh 脚本：[resizefs.sh](./resizefs.sh)
+  > 视频演示中遇到的
+  > ```
+  > open: No such file or directory while opening /dev/sdd2
+  > ```
+  > 这个问题，怀疑是在 fdisk 操作完成之后，在短暂的时间内实际没有同步到磁盘导致的。
+  > 目前在原有脚本的基础上，增加了其间的 sync 操作，来尽量避免这个问题。
+- milkvtech/milkv-duo 基础上新增的 Docker Image
+  - [Dockerfile](./Dockerfile)
+  - [.zshrc](./dot-zshrc)
+
+## 回放视频最后为何把 Stories15M.bin 文件删除的原因
+
+运行操作时，使用了 `run` 函数而非 `./run` 二进制，这个函数是我环境下的用来快速编译 c/cpp 并运行的函数，导致出现此次失误。
diff --git a/Docs/S2311/S2311.PDF b/Docs/S2311/S2311.PDF
new file mode 100644
index 0000000..e349df9
Binary files /dev/null and b/Docs/S2311/S2311.PDF differ
diff --git a/Docs/S2311/dot-zshrc b/Docs/S2311/dot-zshrc
new file mode 100644
index 0000000..c0009c5
--- /dev/null
+++ b/Docs/S2311/dot-zshrc
@@ -0,0 +1,48 @@
+setopt extended_history
+HISTFILE=/home/worker/.zsh_history
+HISTSIZE=1000000
+SAVEHIST=100000
+bindkey -v
+KEYTIMEOUT=1
+zstyle ':completion:*' completer _complete _ignored _approximate
+zstyle ':completion:*' expand prefix
+zstyle ':completion:*' format 'Completing %d'
+zstyle ':completion:*:descriptions' format '%U%d%b%u'
+zstyle ':completion:*:warnings' format '%BSorry, no matches for: %d%b'
+zstyle ':completion:*' group-name ''
+zstyle ':completion:*' ignore-parents parent pwd
+zstyle ':completion:*' insert-unambiguous true
+zstyle ':completion:*' list-colors ${(s.:.)LS_COLORS}
+zstyle ':completion:*' list-prompt '%SAt %p: Hit TAB for more, or the character to insert%s'
+zstyle ':completion:*' list-suffixes true
+zstyle ':completion:*' matcher-list '' 'm:{[:lower:]}={[:upper:]}'
+zstyle ':completion:*' max-errors 0 not-numeric
+zstyle ':completion:*' original true
+zstyle ':completion:*' preserve-prefix '//[^/]##/'
+zstyle ':completion:*' squeeze-slashes true
+zstyle :compinstall filename '~/.zshrc'
+autoload -Uz compinit promptinit vcs_info
+compinit
+promptinit
+bindkey '^R' history-incremental-search-backward
+setopt autocd
+setopt extendedglob
+source /usr/share/zsh-autosuggestions/zsh-autosuggestions.zsh
+source /usr/share/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
+precmd() {
+	local _last_ret=$?
+	local _color=209
+	if [[ ${_last_ret} != 0 ]]; then
+		case ${_last_ret} in
+		130)
+			_last_ret='^C'
+			_color=212
+			;;
+		*)
+			;;
+		esac
+		printf '\x1b[48;5;%dm[DOCKER]  ⤒%s   \x1b[0m\n' ${_color} ${_last_ret}
+	fi
+}
+PROMPT='%B[docker:milkv-duo-self] %~ %#%b '
+alias ls="ls -p --color=auto"
diff --git a/Docs/S2311/resizefs.sh b/Docs/S2311/resizefs.sh
new file mode 100755
index 0000000..4af067c
--- /dev/null
+++ b/Docs/S2311/resizefs.sh
@@ -0,0 +1,119 @@
+#!/bin/bash
+#
+
+SECTORSIZE=512 # bytes
+DISK=$(realpath "$1")
+PARTNUM=${2:-2}
+PARTSIZE=${3:-16G}
+
+set -e
+
+_do() {
+	set -- "$@"
+	echo -e "\x1b[1;32m>>>\x1b[0m" "$@" >&2
+	"$@"
+}
+
+_fatal() {
+	echo "$@" >&2
+	exit 1
+}
+
+if [[ $EUID != 0 ]]; then
+	_fatal "This script must be executed with a priviledged user!"
+fi
+
+# check disk parameter
+if [[ -n "$DISK" ]]; then
+	if [[ ! -b $DISK ]]; then
+		_fatal "The specified file is not a block device!"
+	fi
+else
+	_fatal "Must specify a disk!"
+fi
+
+# check transport protocol
+TRAN=$(lsblk -d -n -o TRAN "$DISK")
+if [[ $TRAN != "usb" ]]; then
+	_fatal       "Normally, the TF card should communicate with the system" \
+		$'\n'"via a USB interface! But the current transport protocol" \
+		$'\n'"is \"$TRAN\"! To avoid damaging this computer's own discs," \
+		$'\n'"this script does not support operations in this situation."
+fi
+
+# warn user
+echo -e "\x1b[1;33;40m"
+echo "===================================================="
+echo "=== PLEASE PAY ATTENTION TO PROTECT YOUR DATA!!! ==="
+echo "===================================================="
+echo -ne "\x1b[0m"
+echo
+echo -e "\x1b[1;31mThe operation will be performed on"
+echo -e "          device: \x1b[1;32m$DISK ($(lsblk -d -n -o SIZE "$DISK"))\x1b[1;31m"
+echo -e "     partition #: \x1b[1;32m$PARTNUM\x1b[1;31m"
+echo -e "  size of sector: \x1b[1;32m$SECTORSIZE bytes\x1b[1;31m"
+echo -e "         size to: \x1b[1;32m$PARTSIZE\x1b[0m"
+_do lsblk --output NAME,SIZE,FSTYPE,MOUNTPOINT,SERIAL,MODEL,TRAN,TYPE "$DISK"
+
+# confirm action
+echo
+read -r -p "Confirm? (y/N) " INPUT
+if [[ ! $INPUT =~ ^[yY]([eE][sS])?$ ]]; then
+	_fatal "Abort!"
+fi
+echo
+
+# wait
+WAIT=5
+echo -e "\x1b[1;31mWait for $WAIT seconds,"$'\n'"If here's something wrong, CTRL-C to abort.\x1b[0m"
+while [[ ${WAIT} -gt 0 ]]; do
+	echo -en "\x1b[1;33m${WAIT} \x1b[m"
+		WAIT=$((WAIT -  1))
+	sleep 1
+done
+echo
+echo
+
+##########
+## MAIN ##
+##########
+
+START_SECTOR=$(_do partx -o START -g --nr "$PARTNUM" "$DISK")
+PARTITIONS=$(_do partx -l "$DISK" | _do wc -l)
+
+# generate fdisk script
+FDISK_SCRIPT=""
+gen_fd_script() {
+	local i
+
+	FDISK_SCRIPT+=$'\n'"p"
+	for (( i=PARTITIONS; i>=PARTNUM; i-- )); do
+		FDISK_SCRIPT+=$'\n'"d"
+		FDISK_SCRIPT+=$'\n'"$i"
+	done
+	FDISK_SCRIPT+=$'\n'"n"
+	FDISK_SCRIPT+=$'\n'"p"
+	FDISK_SCRIPT+=$'\n'"$PARTNUM"
+	FDISK_SCRIPT+=$'\n'"$START_SECTOR"
+	FDISK_SCRIPT+=$'\n'"+${PARTSIZE#+}"
+	FDISK_SCRIPT+=$'\n'"p"
+	FDISK_SCRIPT+=$'\n'"w"
+}
+
+# do fdisk
+gen_fd_script
+_do echo "$FDISK_SCRIPT" | _do fdisk "$DISK"
+
+# get partition device
+PARTDEV=$(_do echo -e "i\n$PARTNUM"  | _do fdisk "$DISK" | _do awk -F' ' '/^\s*Device:/ {printf $2"\n"}')
+PARTSECTORS=$(_do echo -e "i\n$PARTNUM"  | _do fdisk "$DISK" | _do awk -F' ' '/^\s*Sectors:/ {printf $2"\n"}')
+
+_do sync
+
+# resize
+_do resize2fs "$PARTDEV" $((PARTSECTORS * SECTORSIZE / 1024))K
+
+# fsck
+_do e2fsck -f -p "$PARTDEV"
+
+_do sync