diff --git a/docker/scripts/setup-swap.sh b/docker/scripts/setup-swap.sh
index e3cc3740..466c5e10 100755
--- a/docker/scripts/setup-swap.sh
+++ b/docker/scripts/setup-swap.sh
@@ -25,9 +25,9 @@ if [ "$EUID" -ne 0 ]; then
 fi
 
 # 检查是否已有交换分区
-CURRENT_SWAP=$(swapon --show --bytes 2>/dev/null | tail -n +2 | awk '{sum += $3} END {print sum+0}')
-if [ "$CURRENT_SWAP" -gt 0 ]; then
-    CURRENT_SWAP_GB=$(echo "scale=1; $CURRENT_SWAP / 1024 / 1024 / 1024" | bc)
+CURRENT_SWAP_KB=$(grep SwapTotal /proc/meminfo | awk '{print $2}')
+CURRENT_SWAP_GB=$((CURRENT_SWAP_KB / 1024 / 1024))
+if [ "$CURRENT_SWAP_GB" -gt 0 ]; then
     log_warn "系统已有 ${CURRENT_SWAP_GB}GB 交换分区"
     swapon --show
     read -p "是否继续添加新的交换分区？(y/N) " -r
@@ -39,7 +39,7 @@ fi
 
 # 获取系统内存大小（GB）
 TOTAL_MEM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')
-TOTAL_MEM_GB=$(echo "scale=0; $TOTAL_MEM_KB / 1024 / 1024" | bc)
+TOTAL_MEM_GB=$((TOTAL_MEM_KB / 1024 / 1024))
 
 # 确定交换分区大小
 if [ -n "$1" ]; then
diff --git a/install.sh b/install.sh
index 244b5979..de0b8230 100755
--- a/install.sh
+++ b/install.sh
@@ -282,11 +282,13 @@ fi
 # 交换分区配置（仅 Linux）
 # ==============================================================================
 if [[ "$OSTYPE" == "linux-gnu"* ]]; then
-    # 获取当前内存和交换分区大小
+    # 获取当前内存大小（GB，纯 bash 算术）
     TOTAL_MEM_KB=$(grep MemTotal /proc/meminfo | awk '{print $2}')
-    TOTAL_MEM_GB=$(echo "scale=0; $TOTAL_MEM_KB / 1024 / 1024" | bc)
-    CURRENT_SWAP=$(swapon --show --bytes 2>/dev/null | tail -n +2 | awk '{sum += $3} END {print sum+0}')
-    CURRENT_SWAP_GB=$(echo "scale=1; $CURRENT_SWAP / 1024 / 1024 / 1024" | bc)
+    TOTAL_MEM_GB=$((TOTAL_MEM_KB / 1024 / 1024))
+    
+    # 获取当前交换分区大小（GB）
+    CURRENT_SWAP_KB=$(grep SwapTotal /proc/meminfo | awk '{print $2}')
+    CURRENT_SWAP_GB=$((CURRENT_SWAP_KB / 1024 / 1024))
     
     # 推荐交换分区大小（与内存相同，最小1G，最大8G）
     RECOMMENDED_SWAP=$TOTAL_MEM_GB
@@ -297,7 +299,7 @@ if [[ "$OSTYPE" == "linux-gnu"* ]]; then
     info "系统内存: ${TOTAL_MEM_GB}GB，当前交换分区: ${CURRENT_SWAP_GB}GB"
     
     # 如果交换分区小于推荐值，提示用户
-    if [ "$(echo "$CURRENT_SWAP_GB < $RECOMMENDED_SWAP" | bc)" -eq 1 ]; then
+    if [ "$CURRENT_SWAP_GB" -lt "$RECOMMENDED_SWAP" ]; then
         echo -n -e "${BOLD}${CYAN}[?] 是否开启 ${RECOMMENDED_SWAP}GB 交换分区？可提升扫描稳定性 (Y/n) ${RESET}"
         read -r setup_swap
         echo