diff --git a/app/Services/CouponService.php b/app/Services/CouponService.php
index dcae3adb..2228e19b 100644
--- a/app/Services/CouponService.php
+++ b/app/Services/CouponService.php
@@ -182,4 +182,48 @@ class CouponService
             'activity_id'   => $activityId ?? null,
         ];
     }
+
+    /**
+     * 送优惠券
+     *
+     * @param \App\Models\User $user
+     * @param \App\Models\Coupon $coupon
+     * @param int $num
+     * @return void
+     */
+    public function sendCoupon(User $user, Coupon $coupon, int $num)
+    {
+        // 如果优惠券数量有限制，需扣除优惠券库存
+        if ($coupon->limit > 0) {
+            if ($coupon->stock < $num) {
+                throw new BizException('优惠券数量不足');
+            }
+
+            $coupon->decrement('stock', $num);
+        }
+
+        $coupon->increment('sent', $num);
+
+        $tz = now();
+
+        $coupons = [];
+
+        for ($i = 0; $i < $num; $i++) {
+            $coupons[] = [
+                'user_id'       => $user->id,
+                'coupon_id'     => $coupon->id,
+                'coupon_name'   => $coupon->name,
+                'coupon_type'   => $coupon->type,
+                'coupon_amount' => (int) bcmul($coupon->amount, 100),
+                'coupon_threshold'=> (int) bcmul($coupon->threshold, 100),
+                'use_start_at'  => $coupon->use_start_at ?: $tz,
+                'use_end_at'    => $coupon->use_end_at ?: $tz->copy()->addDays($coupon->use_day),
+                'activity_id'   => null,
+                'created_at'    => $tz,
+                'updated_at'    => $tz,
+            ];
+        }
+
+        UserCoupon::insert($coupons);
+    }
 }