diff --git a/create_new_domain_cert.sh b/create_new_domain_cert.sh
index 3cfa1bb..c7c974b 100755
--- a/create_new_domain_cert.sh
+++ b/create_new_domain_cert.sh
@@ -421,34 +421,83 @@ issue_certificate() {
     local tmp_out=$(mktemp)
     local tmp_err=$(mktemp)
 
-    "$ACME_SH" --issue -d "$DOMAIN" --webroot "$WEBROOT" > >(tee "$tmp_out") 2> >(tee "$tmp_err" >&2)
+    # 执行证书申请
+    "$ACME_SH" --issue -d "$DOMAIN" --webroot "$WEBROOT" > >(tee -a "$tmp_out") 2> >(tee -a "$tmp_err" >&2)
     local ret=$?
 
-    # 分析结果
-    if [[ $ret -eq 0 ]]; then
-        # 检查输出是否包含证书内容
-        if grep -q "-----END CERTIFICATE-----" "$tmp_out" || grep -q "-----END CERTIFICATE-----" "$tmp_err"; then
-            log_success "✅ 证书申请成功！"
-            rm -f "$tmp_out" "$tmp_err"
-            return 0
-        else
-            log_warn "证书申请命令返回成功，但未检测到证书内容"
-            log_info "输出内容:"
-            cat "$tmp_out"
-            cat "$tmp_err"
-            rm -f "$tmp_out" "$tmp_err"
-            return 0
+    # 合并所有输出
+    local all_output=$(cat "$tmp_out" "$tmp_err" 2>/dev/null)
+
+    # 智能识别各种成功/跳过情况
+    local success=false
+    local skip_reason=""
+
+    # 情况1: 返回码为0且包含证书
+    if [[ $ret -eq 0 ]] && echo "$all_output" | grep -q "-----END CERTIFICATE-----"; then
+        success=true
+        log_success "✅ 证书申请成功！（新证书）"
+    fi
+
+    # 情况2: 域名无变化，跳过申请（acme.sh认为不需要重复申请）
+    if echo "$all_output" | grep -qE "Domains not changed|Skipping|already issued|Your cert is in"; then
+        success=true
+        skip_reason=$(echo "$all_output" | grep -E "Domains not changed|Skipping|already issued|Your cert is in" | head -n1)
+        
+        # 提取证书路径
+        local cert_path=$(echo "$all_output" | grep "Your cert is in:" | head -n1 | sed 's/.*Your cert is in: //')
+        if [[ -n "$cert_path" ]]; then
+            log_success "✅ 证书已存在且有效"
+            log_info "证书位置: $cert_path"
+            
+            # 验证证书文件是否存在
+            if [[ -f "$cert_path" ]] || [[ -f "${cert_path%.cer}.pem" ]] || [[ -f "${cert_path%.cer}.key" ]]; then
+                log_info "✅ 证书文件验证通过"
+            fi
         fi
+        
+        if echo "$all_output" | grep -q "Domains not changed"; then
+            log_info "证书信息未变化，跳过重复申请"
+        fi
+        if echo "$all_output" | grep -q "Skipping"; then
+            local next_renewal=$(echo "$all_output" | grep "Next renewal time" | head -n1)
+            log_info "$next_renewal"
+        fi
+    fi
+
+    # 情况3: 返回码非0，但证书已存在（某些版本的acme.sh会这样）
+    if [[ $ret -ne 0 ]] && [[ -f "/root/.acme.sh/${DOMAIN}_ecc/${DOMAIN}.cer" ]] || [[ -f "/root/.acme.sh/${DOMAIN}/${DOMAIN}.cer" ]]; then
+        success=true
+        log_warn "⚠️  acme.sh 返回非零 ($ret)，但证书已存在"
+        log_info "继续使用现有证书"
+        
+        # 显示错误信息（但不退出）
+        echo ""
+        log_warn "警告信息:"
+        echo "$all_output" | tail -n 5
+    fi
+
+    # 清理临时文件
+    rm -f "$tmp_out" "$tmp_err"
+
+    # 最终判断
+    if [[ "$success" == "true" ]]; then
+        return 0
     else
+        # 真正的错误情况
         log_error "❌ 证书申请失败 (返回码: $ret)"
         echo ""
-        echo "========== 错误输出 =========="
-        cat "$tmp_err"
-        echo "=============================="
+        echo "========== 完整输出 =========="
+        echo "$all_output"
+        echo "==============================="
         echo ""
-        log_error "请检查日志: $LOG_FILE"
-        rm -f "$tmp_out" "$tmp_err"
-        exit 1
+        log_error "请检查以上输出并确认:"
+        echo "  1. 域名是否正确解析到此服务器"
+        echo "  2. 防火墙是否开放 80 和 443 端口"
+        echo "  3. nginx 是否正常运行"
+        echo "  4. webroot 目录是否可写"
+        echo ""
+        log_error "详细日志: $LOG_FILE"
+        return 1
     fi
 }