diff --git a/inc/helpers/aksrt-vip.php b/inc/helpers/aksrt-vip.php
index e2bcec03..56233b9e 100644
--- a/inc/helpers/aksrt-vip.php
+++ b/inc/helpers/aksrt-vip.php
@@ -65,10 +65,20 @@ function aksrt_get_user_vip_level(int $user_id = 0): int {
 
     if ($meta_level > 0) {
         if ($expires > 0 && $expires < time()) {
-            // 过期：lazy 清 level，记录上次等级（zibll vip_level_expired）。
-            update_user_meta($user_id, 'aksrt_vip_level_expired', min(2, max(1, $meta_level)));
-            update_user_meta($user_id, 'aksrt_vip_level', 0);
-            $candidate = 0;
+            $base_level = (int) get_user_meta($user_id, 'aksrt_vip_base_level', true);
+            $base_expires = (int) get_user_meta($user_id, 'aksrt_vip_base_expires', true);
+            if ($base_level > 0) {
+                update_user_meta($user_id, 'aksrt_vip_level', $base_level);
+                update_user_meta($user_id, 'aksrt_vip_expires', $base_expires);
+                delete_user_meta($user_id, 'aksrt_vip_base_level');
+                delete_user_meta($user_id, 'aksrt_vip_base_expires');
+                $candidate = min(2, max(0, $base_level));
+            } else {
+                // 过期：lazy 清 level，记录上次等级（zibll vip_level_expired）。
+                update_user_meta($user_id, 'aksrt_vip_level_expired', min(2, max(1, $meta_level)));
+                update_user_meta($user_id, 'aksrt_vip_level', 0);
+                $candidate = 0;
+            }
         } else {
             // expires === 0 视为永久；expires >= now 视为有效。
             $candidate = min(2, max(0, $meta_level));
diff --git a/inc/helpers/user-center-renderers/vip-tab.php b/inc/helpers/user-center-renderers/vip-tab.php
index 6ea2fc1b..3163169f 100644
--- a/inc/helpers/user-center-renderers/vip-tab.php
+++ b/inc/helpers/user-center-renderers/vip-tab.php
@@ -30,6 +30,8 @@ if (class_exists('\\AKSRT\\Content\\VipService')) {
 	$currency_name = (string) ($vip_catalog['currency_name'] ?? $currency_name);
 }
 $expires = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
+$base_level = (int) get_user_meta($user_id, 'aksrt_vip_base_level', true);
+$base_expires = (int) get_user_meta($user_id, 'aksrt_vip_base_expires', true);
 $expired_level = (int) get_user_meta($user_id, 'aksrt_vip_level_expired', true);
 $levels = is_array($vip_settings['levels'] ?? null) ? $vip_settings['levels'] : [];
 $desc_top = (string) ($vip_settings['desc'] ?? '');
@@ -62,7 +64,14 @@ if ($level > 0) {
 		$vip_state       = 'active';
 		$vip_state_label = __('生效中', 'aksrt');
 		$vip_expiry_text = sprintf(__('到期时间：%s', 'aksrt'), wp_date('Y年m月d日', $expires));
-		$btn_type        = 'renew_' . $level;
+		if ($base_level > 0 && $base_level < $level) {
+			$base_name = (string) ($levels[$base_level]['name'] ?? ('VIP' . $base_level));
+			$base_expiry_text = $base_expires > 0
+				? wp_date('Y年m月d日', $base_expires)
+				: __('永久', 'aksrt');
+			$vip_expiry_text .= '；' . sprintf(__('%s：%s', 'aksrt'), $base_name, $base_expiry_text);
+		}
+		$btn_type       = 'renew_' . $level;
 	}
 } elseif ($expired_level > 0) {
 	$vip_state        = 'expired';
diff --git a/src/Admin/Schema/SchemaPayment.php b/src/Admin/Schema/SchemaPayment.php
index ce107f99..b88e04f2 100644
--- a/src/Admin/Schema/SchemaPayment.php
+++ b/src/Admin/Schema/SchemaPayment.php
@@ -129,7 +129,7 @@ class SchemaPayment {
                         ]],
                         ['key' => 'points_exchange', 'title' => '积分兑换会员', 'fields' => [
                             ['key' => 'pay_vip_points_exchange_s', 'label' => '启用积分兑换', 'type' => 'switch', 'default' => false],
-                            ['key' => 'payment_vip_points_packages', 'label' => '兑换套餐', 'type' => 'textarea', 'default' => "1|500|30|积分月卡\n1|5000|0|积分永久", 'dependsOn' => ['key' => 'pay_vip_points_exchange_s', 'value' => true], 'help' => '每行：等级|积分|天数|标题（天数 0=永久；仅未开通会员可兑）'],
+                            ['key' => 'payment_vip_points_packages', 'label' => '兑换套餐', 'type' => 'textarea', 'default' => "1|500|30|积分月卡\n1|5000|0|积分永久", 'dependsOn' => ['key' => 'pay_vip_points_exchange_s', 'value' => true], 'help' => '每行：等级|积分|天数|标题（天数 0=永久；普通用户可开通，已有会员可续费同等级或升级更高等级）'],
                             ['key' => 'pay_vip_points_exchange_desc', 'label' => '兑换说明', 'type' => 'textarea', 'default' => '', 'dependsOn' => ['key' => 'pay_vip_points_exchange_s', 'value' => true]],
                         ]],
                         ['key' => 'benefit', 'title' => '下载权益', 'fields' => [
diff --git a/src/Content/VipServicePurchase.php b/src/Content/VipServicePurchase.php
index 45704ded..f832f2ed 100644
--- a/src/Content/VipServicePurchase.php
+++ b/src/Content/VipServicePurchase.php
@@ -515,6 +515,16 @@ trait VipServicePurchase {
 
         $previous_level = (int) get_user_meta($user_id, 'aksrt_vip_level', true);
         $previous_expiry = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
+        $finite_duration = $time > 0 || $days > 0;
+        if ($previous_level > 0 && $previous_expiry === 0 && $level > $previous_level && $finite_duration) {
+            // Preserve a permanent lower tier while a finite higher-tier upgrade is active.
+            update_user_meta($user_id, 'aksrt_vip_base_level', $previous_level);
+            update_user_meta($user_id, 'aksrt_vip_base_expires', 0);
+        } else {
+            // Only a finite higher-tier upgrade may keep a layered base membership.
+            delete_user_meta($user_id, 'aksrt_vip_base_level');
+            delete_user_meta($user_id, 'aksrt_vip_base_expires');
+        }
         $fulfilled = false;
         // unit upgrade: raise level only, keep current expiry (zibll).
         if ($upgrade_mode === 'unit') {
@@ -574,14 +584,15 @@ trait VipServicePurchase {
 
         if ($days <= 0) {
             // Permanent.
+            delete_user_meta($user_id, 'aksrt_vip_base_level');
+            delete_user_meta($user_id, 'aksrt_vip_base_expires');
             update_user_meta($user_id, 'aksrt_vip_expires', 0);
             return;
         }
 
         $current_exp = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
-        if ($current_exp === 0 && $current_level > 0) {
-            // Already permanent — keep permanent.
-            return;
+        if ($current_exp === 0 && $current_level > 0 && $level <= $current_level) {
+            return; // keep an existing permanent level when not upgrading it
         }
         $base = max($current_exp, time());
         update_user_meta($user_id, 'aksrt_vip_expires', $base + ($days * DAY_IN_SECONDS));
@@ -603,13 +614,15 @@ trait VipServicePurchase {
         delete_user_meta($user_id, 'aksrt_vip_level_expired');
 
         if ($time <= 0) {
+            delete_user_meta($user_id, 'aksrt_vip_base_level');
+            delete_user_meta($user_id, 'aksrt_vip_base_expires');
             update_user_meta($user_id, 'aksrt_vip_expires', 0);
             return;
         }
 
         $current_exp = (int) get_user_meta($user_id, 'aksrt_vip_expires', true);
-        if ($current_exp === 0 && $current_level > 0) {
-            return; // keep permanent
+        if ($current_exp === 0 && $current_level > 0 && $level <= $current_level) {
+            return; // keep an existing permanent level when not upgrading it
         }
         $base = max($current_exp, time());
         $modifier = $unit === 'month'