diff --git a/server-rs/crates/module-runtime/src/membership/upgrade.rs b/server-rs/crates/module-runtime/src/membership/upgrade.rs
index 169f3213e..05f9690e6 100644
--- a/server-rs/crates/module-runtime/src/membership/upgrade.rs
+++ b/server-rs/crates/module-runtime/src/membership/upgrade.rs
@@ -143,6 +143,9 @@ pub fn check_runtime_profile_membership_upgrade_allowed(
 /// 期号是同一期账期的两个口径，账期已刷新仍按旧 `cycle_index` 报价会多收整整一个完整月
 /// （年付还会把补点算成 0）。生产入口先用 `project_profile_membership_cycle_at` 把会员行
 /// 投射到当前账期，因此这里拒绝的只会是「拿过期账期直接报价」的错误调用方。
+///
+/// 到期时刻不能早于本期刷新时刻（`expires_at >= cycle_resets_at`）：账期刷新的前提是会员仍在
+/// 有效期内，否则报价会回显一个早于下次刷新日的到期时间，得到自相矛盾的结果。
 fn validate_runtime_profile_membership_upgrade_quote_input(
     input: &RuntimeProfileMembershipUpgradeQuoteInput,
 ) -> Result<(), RuntimeProfileMembershipUpgradeRejection> {
@@ -151,7 +154,9 @@ fn validate_runtime_profile_membership_upgrade_quote_input(
     let window_out_of_order = input.cycle_resets_at_micros <= input.cycle_started_at_micros;
     let now_outside_window = input.now_micros < input.cycle_started_at_micros
         || input.now_micros >= input.cycle_resets_at_micros;
-    if cycle_index_out_of_range || window_out_of_order || now_outside_window {
+    let expiry_out_of_order = input.expires_at_micros < input.cycle_resets_at_micros;
+    if cycle_index_out_of_range || window_out_of_order || now_outside_window || expiry_out_of_order
+    {
         return Err(RuntimeProfileMembershipUpgradeRejection::InvalidQuoteInput);
     }
     Ok(())
@@ -453,6 +458,14 @@ mod tests {
             }),
             Err(RuntimeProfileMembershipUpgradeRejection::InvalidQuoteInput)
         );
+        // 中文注释：到期时刻早于本期刷新时刻属于自相矛盾的入参，必须显式拒绝。
+        assert_eq!(
+            quote_runtime_profile_membership_upgrade(RuntimeProfileMembershipUpgradeQuoteInput {
+                expires_at_micros: beijing(2026, 7, 1, 9),
+                ..base_input()
+            }),
+            Err(RuntimeProfileMembershipUpgradeRejection::InvalidQuoteInput)
+        );
     }
 
     #[test]