diff --git a/server-rs/crates/api-server/src/runtime_profile.rs b/server-rs/crates/api-server/src/runtime_profile.rs
index 9d585f6c5..672c5da4f 100644
--- a/server-rs/crates/api-server/src/runtime_profile.rs
+++ b/server-rs/crates/api-server/src/runtime_profile.rs
@@ -1516,6 +1516,7 @@ fn is_runtime_profile_membership_domain_error(message: &str) -> bool {
                 | "当前套餐已生效，无需重复购买"
                 | "当前会员有效期内不支持月付 / 年付转换，到期后可重新选择"
                 | "会员已到期，请按新购价格重新下单"
+                | "会员状态已变化，请重新下单"
         )
 }
 
diff --git a/server-rs/crates/spacetime-module/src/runtime/active/profile.rs b/server-rs/crates/spacetime-module/src/runtime/active/profile.rs
index 17811db29..737d1ff0c 100644
--- a/server-rs/crates/spacetime-module/src/runtime/active/profile.rs
+++ b/server-rs/crates/spacetime-module/src/runtime/active/profile.rs
@@ -9867,6 +9867,14 @@ fn apply_profile_membership_purchase(
 
     if settlement.change_kind == RuntimeProfileMembershipChangeKind::Upgrade {
         if let Some(row) = active_row {
+            // 中文注释：结算前比对订单冻结的变更前状态。若用户已先付了更高档位的升级单、
+            // 或到期后按不同周期重新购买，旧升级单直接落库会把档位 / 周期覆盖回去，
+            // 只剩原到期日，产生降档或「年付 + 一个月到期」的矛盾行，因此拒绝并要求重新下单。
+            if settlement.plan_before != Some(row.plan)
+                || settlement.cycle_kind_before != Some(row.cycle_kind)
+            {
+                return Err("会员状态已变化，请重新下单".to_string());
+            }
             return apply_profile_membership_upgrade(
                 ctx,
                 user_id,