diff --git a/internal/service/package/activation_service.go b/internal/service/package/activation_service.go
index 65fdd3c..e6a1a90 100644
--- a/internal/service/package/activation_service.go
+++ b/internal/service/package/activation_service.go
@@ -552,8 +552,12 @@ func (s *ActivationService) isCarrierRealnamed(ctx context.Context, tx *gorm.DB,
 }
 
 func (s *ActivationService) activatePendingUsage(ctx context.Context, tx *gorm.DB, usage *model.PackageUsage, pkg *model.Package, carrierType string, carrierID uint, now time.Time, logMessage string) error {
+	// ExpiryBase=from_purchase 只用于"等待实名激活"场景（REALNAME-04）：套餐已购买但资产未实名，
+	// 计时基准按购买时间算，实名只是解锁使用权。此函数同时被"前一个主套餐到期后排队顺延"场景复用，
+	// 这种情况下 usage.PendingRealnameActivation 为 false，不应该套用购买时间，否则排队等待的天数会
+	// 从到期时间里被扣掉。只有当这条记录确实是因为等实名才被搁置时，才按 ExpiryBase 选基准。
 	var activatedAt time.Time
-	if pkg.ExpiryBase == "from_purchase" {
+	if usage.PendingRealnameActivation && pkg.ExpiryBase == "from_purchase" {
 		activatedAt = usage.CreatedAt
 	} else {
 		activatedAt = now