diff --git a/CoreCms.Net.Model/ViewModels/SQ/SQReservationsDto.cs b/CoreCms.Net.Model/ViewModels/SQ/SQReservationsDto.cs
index 7b1913d..337d9f6 100644
--- a/CoreCms.Net.Model/ViewModels/SQ/SQReservationsDto.cs
+++ b/CoreCms.Net.Model/ViewModels/SQ/SQReservationsDto.cs
@@ -146,4 +146,22 @@ namespace CoreCms.Net.Model.ViewModels.SQ
         public string important_data { get; set; }
     }
 
+    /// <summary>
+    /// 取消预约DTO
+    /// </summary>
+    public class SQReservationCancelDto
+    {
+        /// <summary>
+        /// 预约ID
+        /// </summary>
+        [Required(ErrorMessage = "请输入预约ID")]
+        public int reservation_id { get; set; }
+
+        /// <summary>
+        /// 取消原因
+        /// </summary>
+        [StringLength(maximumLength: 255, ErrorMessage = "取消原因不能超过{1}字")]
+        public string cancel_reason { get; set; }
+    }
+
 }
diff --git a/CoreCms.Net.Web.WebApi/Controllers/SQController.cs b/CoreCms.Net.Web.WebApi/Controllers/SQController.cs
index 953f863..753b29d 100644
--- a/CoreCms.Net.Web.WebApi/Controllers/SQController.cs
+++ b/CoreCms.Net.Web.WebApi/Controllers/SQController.cs
@@ -24,7 +24,6 @@ using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Threading.Tasks;
-using CoreCms.Net.Services.SQ;
 using CoreCms.Net.Utility.Extensions;
 using ToolGood.Words.internals;
 using NPOI.SS.Formula.PTG;
@@ -725,9 +724,134 @@ ISQRoomUnavailableTimesServices sQRoomUnavailableTimesServices
         return new WebApiDto
         {
             Code = 0,
-            Data = null,
+            Data = new { reservation_id = reservationId },
             Msg = "加入预约成功"
         };
     }
 
+    /// <summary>
+    /// 取消预约接口
+    /// </summary>
+    /// <param name="dto">取消预约参数</param>
+    /// <returns></returns>
+    [HttpPost]
+    [Authorize]
+    public async Task<WebApiDto> CancelReservation([FromBody] SQReservationCancelDto dto)
+    {
+        var userId = _user.ID;
+
+        // 1. 参数校验
+        if (dto == null || dto.reservation_id <= 0)
+        {
+            return new WebApiDto()
+            {
+                Code = 500,
+                Data = null,
+                Msg = "参数错误"
+            };
+        }
+
+        // 2. 查询预约是否存在
+        var reservation = await _SQReservationsServices.QueryByClauseAsync(
+            r => r.id == dto.reservation_id,
+            r => r.id, OrderByType.Asc);
+        if (reservation == null)
+        {
+            return new WebApiDto()
+            {
+                Code = 404,
+                Data = null,
+                Msg = "预约不存在"
+            };
+        }
+
+        // 3. 检查预约状态是否允许取消
+        if (reservation.status >= 2) // 2=已结束，3=取消，4=用户取消
+        {
+            return new WebApiDto()
+            {
+                Code = 400,
+                Data = null,
+                Msg = "该预约已结束或已取消，无法再次取消"
+            };
+        }
+
+        // 4. 检查用户是否有权限取消该预约
+        var participant = await _SQReservationParticipantsServices.QueryByClauseAsync(
+            p => p.reservation_id == dto.reservation_id && p.user_id == userId,
+            p => p.id, OrderByType.Asc);
+        if (participant == null)
+        {
+            return new WebApiDto()
+            {
+                Code = 403,
+                Data = null,
+                Msg = "您没有权限取消该预约"
+            };
+        }
+
+        // 5. 检查是否已经开始（如果已经开始，只有发起者可以取消）
+        var now = DateTime.Now;
+        if (reservation.start_time <= now && participant.role != 1)
+        {
+            return new WebApiDto()
+            {
+                Code = 400,
+                Data = null,
+                Msg = "预约已开始，只有发起者可以取消"
+            };
+        }
+
+        // 6. 更新预约状态为4（用户取消）
+        var updateResult = await _SQReservationsServices.UpdateAsync(
+            it => new SQReservations
+            {
+                status = 3, // 用户取消
+                updated_at = DateTime.Now,
+                remarks = string.IsNullOrEmpty(dto.cancel_reason) ? "未支付鸽子费" : dto.cancel_reason
+            },
+            it => it.id == dto.reservation_id);
+
+        if (!updateResult)
+        {
+            return new WebApiDto()
+            {
+                Code = 500,
+                Data = null,
+                Msg = "取消预约失败"
+            };
+        }
+
+        // 7. 更新参与人状态为已退出（如果是发起者取消整个预约，所有参与人都标记为退出）
+        if (participant.role == 1) // 发起者取消
+        {
+            // 发起者取消整个预约，所有参与人都标记为退出
+            await _SQReservationParticipantsServices.UpdateAsync(
+                it => new SQReservationParticipants
+                {
+                    status = 1, // 已退出
+                    quit_time = DateTime.Now
+                },
+                it => it.reservation_id == dto.reservation_id);
+        }
+        else // 参与者取消
+        {
+            // 参与者只退出自己
+            await _SQReservationParticipantsServices.UpdateAsync(
+                it => new SQReservationParticipants
+                {
+                    status = 1, // 已退出
+                    quit_time = DateTime.Now
+                },
+                it => it.reservation_id == dto.reservation_id && it.user_id == userId);
+        }
+
+        return new WebApiDto()
+        {
+            Code = 0,
+            Data = null,
+            Msg = "取消预约成功"
+        };
+    }
+
 }
diff --git a/CoreCms.Net.Web.WebApi/Doc.xml b/CoreCms.Net.Web.WebApi/Doc.xml
index 0192e06..5dcb3b7 100644
--- a/CoreCms.Net.Web.WebApi/Doc.xml
+++ b/CoreCms.Net.Web.WebApi/Doc.xml
@@ -842,6 +842,13 @@
             <param name="dto">预约</param>
             <returns></returns>
         </member>
+        <member name="M:CoreCms.Net.Web.WebApi.Controllers.SQController.CancelReservation(CoreCms.Net.Model.ViewModels.SQ.SQReservationCancelDto)">
+            <summary>
+            取消预约接口
+            </summary>
+            <param name="dto">取消预约参数</param>
+            <returns></returns>
+        </member>
         <member name="T:CoreCms.Net.Web.WebApi.Controllers.StoreController">
             <summary>
             门店调用接口数据