diff --git a/apis/hole/apis.go b/apis/hole/apis.go
index 2bae997a..3360f37e 100644
--- a/apis/hole/apis.go
+++ b/apis/hole/apis.go
@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+	"math/rand"
 	"net/http"
 	"slices"
 	"strconv"
@@ -992,12 +993,12 @@ func GenerateSummary(c *fiber.Ctx) error {
 		})
 	}
 	if forceRefresh {
-		err := DeleteCache(fmt.Sprintf("AISummary_%d_v%d", id, hole.Reply-hole.Reply%config.Config.SummarySteps))
+		err := DeleteCache(hole.SummaryCacheName())
 		if err != nil {
 			log.Err(err).Msg("AISummary: delete cache err")
 		}
 	}
-	if GetCache(fmt.Sprintf("AISummary_%d_v%d", id, hole.Reply-hole.Reply%config.Config.SummarySteps), &cachedData) {
+	if GetCache(hole.SummaryCacheName(), &cachedData) {
 
 		switch cachedData.Code {
 		case 1000:
@@ -1053,7 +1054,7 @@ func GenerateSummary(c *fiber.Ctx) error {
 							Msg("AISummary: hole id error")
 						cachedData.Data.HoleID = id
 					}
-					err = SetCache(fmt.Sprintf("AISummary_%d_v%d", id, hole.Reply-hole.Reply%config.Config.SummarySteps), cachedData, 24*time.Hour)
+					err = SetCache(hole.SummaryCacheName(), cachedData, 24*time.Hour)
 					if err != nil {
 						log.Err(err).Msg("AISummary: set cache err")
 					}
@@ -1061,14 +1062,14 @@ func GenerateSummary(c *fiber.Ctx) error {
 				return c.Status(200).JSON(cachedData)
 
 			} else {
-				err := DeleteCache(fmt.Sprintf("AISummary_%d_v%d", id, hole.Reply-hole.Reply%config.Config.SummarySteps))
+				err := DeleteCache(hole.SummaryCacheName())
 				if err != nil {
 					log.Err(err).Msg("AISummary: delete cache err")
 				}
 			}
 
 		default:
-			err := DeleteCache("AISummary" + strconv.Itoa(id))
+			err := DeleteCache(hole.SummaryCacheName())
 			if err != nil {
 				log.Err(err).Msg("AISummary: delete cache err")
 			}
@@ -1087,6 +1088,54 @@ func GenerateSummary(c *fiber.Ctx) error {
 	if err != nil {
 		return err
 	}
+
+	if len(floors) > config.Config.MaxSummaryFloors {
+		// 1. 按 UpdatedAt 升序排序
+		slices.SortFunc(floors, func(a, b *Floor) int {
+			if a.UpdatedAt.Equal(b.UpdatedAt) {
+				return 0
+			}
+			if a.UpdatedAt.Before(b.UpdatedAt) {
+				return -1
+			}
+			return 1
+		})
+
+		// 2. 提取头尾
+		earliestFloors := config.Config.MaxSummaryFloors / 5
+		newestFloors := config.Config.MaxSummaryFloors / 5 * 2
+		earliest := floors[:earliestFloors]
+		newest := floors[len(floors)-newestFloors:]
+
+		// 3. 提取中间并按 Like 降序筛选
+		middle := make(Floors, len(floors)-earliestFloors-newestFloors)
+		copy(middle, floors[earliestFloors:len(floors)-newestFloors]) // copy 防止影响原切片顺序
+
+		rand.Shuffle(len(middle), func(i, j int) {
+			middle[i], middle[j] = middle[j], middle[i]
+		})
+
+		slices.SortFunc(middle, func(a, b *Floor) int {
+			return b.Like - a.Like
+		})
+
+		// 4.即使中间不足20条也能安全截取 (len(floors)>50 保证了 middle 长度至少为 21)
+		topLikes := middle[:config.Config.MaxSummaryFloors-earliestFloors-newestFloors]
+
+		// 5. 合并
+		newFloors := make(Floors, 0, config.Config.MaxSummaryFloors)
+		newFloors = append(newFloors, earliest...)
+		newFloors = append(newFloors, topLikes...)
+		newFloors = append(newFloors, newest...)
+
+		floors = newFloors
+
+		// 6. 按 ID 重新排序以恢复对话流上下文
+		slices.SortFunc(floors, func(a, b *Floor) int {
+			return a.Ranking - b.Ranking
+		})
+	}
+
 	content := ""
 	if hole.HoleFloor.FirstFloor != nil {
 		content = hole.HoleFloor.FirstFloor.Content
@@ -1105,7 +1154,6 @@ func GenerateSummary(c *fiber.Ctx) error {
 			FloorID:   floor.FloorID,
 		}
 	}
-
 	requestBody := map[string]any{
 		"floors":   summaryFloors,
 		"content":  content,
@@ -1185,7 +1233,7 @@ func GenerateSummary(c *fiber.Ctx) error {
 	case 1000, 1001:
 		var cache Summary
 		cache.Code = 1001
-		err := SetCache(fmt.Sprintf("AISummary_%d_v%d", id, hole.Reply-hole.Reply%config.Config.SummarySteps), cache, 24*time.Hour)
+		err := SetCache(hole.SummaryCacheName(), cache, 24*time.Hour)
 		if err != nil {
 			log.Err(err).Msg("AISummary: set cache err")
 		}
diff --git a/config/config.go b/config/config.go
index 224cd07b..1de28637 100644
--- a/config/config.go
+++ b/config/config.go
@@ -59,8 +59,12 @@ var Config struct {
 	SummaryFloorLimit            int      `env:"SUMMARY_FLOOR_LIMIT" envDefault:"15"`
 	SummaryContentLimit          int64    `env:"SUMMARY_CONTENT_LIMIT" envDefault:"500"`
 	SummarySteps                 int      `env:"SUMMARY_STEPS" envDefault:"5"`
+	SummaryReplyBoundary1        int      `env:"SUMMARY_REPLY_BOUNDARY_1" envDefault:"50"`
+	SummaryReplyBoundary2        int      `env:"SUMMARY_REPLY_BOUNDARY_1" envDefault:"200"`
+	SummaryReplyBoundary3        int      `env:"SUMMARY_REPLY_BOUNDARY_1" envDefault:"1000"`
 	SummaryLogLimit              int      `env:"SUMMARY_LOG_LIMIT" envDefault:"1000"`
 	WhiteListUserIds             []int    `env:"WHITE_LIST_USER_IDS"`
+	MaxSummaryFloors             int      `env:"MAX_FLOORS_PER_HOLE" envDefault:"50"`
 }
 
 var DynamicConfig struct {
diff --git a/models/hole.go b/models/hole.go
index 9992b593..e43654cf 100644
--- a/models/hole.go
+++ b/models/hole.go
@@ -98,6 +98,20 @@ func (hole *Hole) CacheName() string {
 	return fmt.Sprintf("hole_%d", hole.ID)
 }
 
+func (hole *Hole) SummaryCacheName() string {
+	var step int
+	if hole.Reply <= config.Config.SummaryReplyBoundary1 {
+		step = config.Config.SummarySteps
+	} else if hole.Reply > config.Config.SummaryReplyBoundary1 && hole.Reply <= config.Config.SummaryReplyBoundary2 {
+		step = config.Config.SummarySteps * 2
+	} else if hole.Reply > config.Config.SummaryReplyBoundary2 && hole.Reply <= config.Config.SummaryReplyBoundary3 {
+		step = config.Config.SummarySteps * 4
+	} else {
+		step = config.Config.SummarySteps * 10
+	}
+	return fmt.Sprintf("AISummary_%d_v%d", hole.ID, hole.Reply-hole.Reply%step)
+}
+
 type Holes []*Hole
 
 func IsHolesExist(tx *gorm.DB, holeID []int) bool {