diff --git a/emmc_backup_from_sd.sh b/emmc_backup_from_sd.sh
new file mode 100644
index 0000000..00adef8
--- /dev/null
+++ b/emmc_backup_from_sd.sh
@@ -0,0 +1,143 @@
+#!/bin/bash
+#===============================================================================
+# 从SD卡操作eMMC备份脚本
+#===============================================================================
+
+set -e
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+NC='\033[0m'
+
+error_msg() { echo -e "${RED}[ERROR] $1${NC}" >&2; exit 1; }
+info_msg() { echo -e "${GREEN}[INFO] $1${NC}"; }
+warn_msg() { echo -e "${YELLOW}[WARN] $1${NC}"; }
+
+[[ $EUID -eq 0 ]] || error_msg "需要root权限"
+
+EMMC_DEV="/dev/mmcblk0"
+USB_DIR="/mnt/XIN_USB/rock5c"
+OUTPUT_FILE="${USB_DIR}/rock5c_emmc_$(date +%Y%m%d_%H%M%S).img"
+
+info_msg "从SD卡备份eMMC..."
+info_msg "eMMC设备: ${EMMC_DEV}"
+info_msg "输出到: ${OUTPUT_FILE}"
+
+# 检查设备
+[[ -b "${EMMC_DEV}" ]] || error_msg "eMMC设备不存在: ${EMMC_DEV}"
+[[ -d "${USB_DIR}" ]] || error_msg "USB目录不存在: ${USB_DIR}"
+
+# 检查eMMC没有被挂载
+if mount | grep -q mmcblk0; then
+    error_msg "eMMC还在使用中！请确保从SD卡启动"
+fi
+
+info_msg "✅ eMMC设备可安全操作"
+
+# 步骤1: 检查eMMC分区信息
+info_msg "步骤1: 分析eMMC分区..."
+parted -s ${EMMC_DEV} unit MB print
+
+# 检查eMMC上的数据大小
+info_msg "检查eMMC数据使用量..."
+TEMP_MOUNT="/tmp/check_emmc"
+mkdir -p "${TEMP_MOUNT}"
+
+# 临时挂载检查使用量
+mount ${EMMC_DEV}p2 "${TEMP_MOUNT}" -o ro
+EMMC_USED=$(df --block-size=1M "${TEMP_MOUNT}" | tail -1 | awk '{print $3}')
+umount "${TEMP_MOUNT}"
+
+mount ${EMMC_DEV}p1 "${TEMP_MOUNT}" -o ro  
+EMMC_BOOT_USED=$(df --block-size=1M "${TEMP_MOUNT}" | tail -1 | awk '{print $3}')
+umount "${TEMP_MOUNT}"
+
+rm -rf "${TEMP_MOUNT}"
+
+info_msg "eMMC使用情况: Root ${EMMC_USED}MB + Boot ${EMMC_BOOT_USED}MB"
+
+# 步骤2: 智能收缩eMMC分区
+info_msg "步骤2: 智能收缩eMMC分区..."
+
+# 文件系统检查
+e2fsck -f -y ${EMMC_DEV}p2
+
+# 先尝试收缩到最小值
+info_msg "计算文件系统最小大小..."
+resize2fs -M ${EMMC_DEV}p2
+
+# 获取收缩后的实际大小
+FS_SIZE_BLOCKS=$(dumpe2fs -h ${EMMC_DEV}p2 2>/dev/null | grep "^Block count:" | awk '{print $3}')
+FS_SIZE_MB=$(( (FS_SIZE_BLOCKS * 4) / 1024 + 200 ))  # 块大小4KB + 200MB缓冲
+
+info_msg "文件系统最小大小: ${FS_SIZE_MB}MB"
+
+# 扩展一点给缓冲空间
+SHRINK_TARGET=$((FS_SIZE_MB + 300))
+resize2fs ${EMMC_DEV}p2 ${SHRINK_TARGET}M
+
+# 收缩分区
+P2_START=$(parted -s ${EMMC_DEV} unit B print | grep "^ 2" | awk '{print $2}' | sed 's/B$//')
+NEW_P2_END=$((P2_START + SHRINK_TARGET * 1048576))
+
+# 记录原始分区信息
+parted -s ${EMMC_DEV} unit B print > "${USB_DIR}/emmc_original_layout.txt"
+ORIGINAL_P2_END=$(parted -s ${EMMC_DEV} unit B print | grep "^ 2" | awk '{print $3}' | sed 's/B$//')
+
+# 重新创建收缩的分区
+parted -s ${EMMC_DEV} rm 2
+parted -s ${EMMC_DEV} mkpart primary ext4 ${P2_START}B ${NEW_P2_END}B
+
+info_msg "✅ eMMC分区已收缩"
+
+# 步骤3: 备份收缩后的eMMC
+info_msg "步骤3: 备份收缩后的eMMC..."
+BACKUP_SIZE_MB=$(( (NEW_P2_END / 1048576) + 100 ))
+dd if=${EMMC_DEV} of="${OUTPUT_FILE}" bs=1M count=${BACKUP_SIZE_MB} status=progress
+
+info_msg "✅ eMMC备份完成"
+
+# 步骤4: 恢复eMMC原始大小
+info_msg "步骤4: 恢复eMMC原始分区大小..."
+parted -s ${EMMC_DEV} rm 2
+parted -s ${EMMC_DEV} mkpart primary ext4 ${P2_START}B ${ORIGINAL_P2_END}B
+resize2fs ${EMMC_DEV}p2
+
+info_msg "✅ eMMC已恢复原始大小"
+
+# 验证备份镜像
+info_msg "步骤5: 验证备份镜像..."
+LOOP_DEV=$(losetup -P -f --show "${OUTPUT_FILE}")
+sleep 3
+
+if [[ -b "${LOOP_DEV}p1" ]] && [[ -b "${LOOP_DEV}p2" ]]; then
+    info_msg "✅ 备份镜像分区表完整"
+    parted -s "${LOOP_DEV}" print
+    
+    # 检查文件系统
+    e2fsck -n "${LOOP_DEV}p1" && echo "✅ Boot分区文件系统正常"
+    e2fsck -n "${LOOP_DEV}p2" && echo "✅ Root分区文件系统正常"
+else
+    warn_msg "❌ 备份镜像分区表有问题"
+fi
+
+losetup -d "${LOOP_DEV}"
+
+FINAL_SIZE=$(du -h "${OUTPUT_FILE}" | cut -f1)
+FINAL_SIZE_ACTUAL=$(du --apparent-size -h "${OUTPUT_FILE}" | cut -f1)
+
+info_msg "========================================="
+info_msg "🎉 eMMC备份成功完成!"
+info_msg "========================================="
+info_msg "📁 备份文件: ${OUTPUT_FILE}"
+info_msg "📏 实际大小: ${FINAL_SIZE}"
+info_msg "📐 逻辑大小: ${FINAL_SIZE_ACTUAL}"
+info_msg "💾 eMMC已恢复原状"
+info_msg ""
+info_msg "🚀 部署到新设备:"
+info_msg "   dd if=$(basename ${OUTPUT_FILE}) of=/dev/mmcblk0 bs=4M status=progress"
+info_msg ""
+info_msg "✅ 包含完整分区表和bootloader"
+info_msg "✅ 保持所有原始配置不变"
+info_msg "✅ 可在任意Rock5c上启动"
+info_msg "========================================="
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