diff --git a/internal/api/handler/device_handler.go b/internal/api/handler/device_handler.go
index 407a978..98f6248 100644
--- a/internal/api/handler/device_handler.go
+++ b/internal/api/handler/device_handler.go
@@ -10,6 +10,7 @@ import (
 
 	"github.com/user-management-system/internal/api/middleware"
 	"github.com/user-management-system/internal/domain"
+	"github.com/user-management-system/internal/pagination"
 	"github.com/user-management-system/internal/service"
 )
 
@@ -88,9 +89,9 @@ func (h *DeviceHandler) GetMyDevices(c *gin.Context) {
 	}
 
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
-	if pageSize < 1 || pageSize > 100 {
-		pageSize = 20
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
+	if pageSize < 1 || pageSize > pagination.MaxPageSize {
+		pageSize = pagination.DefaultPageSize
 	}
 
 	devices, total, err := h.deviceService.GetUserDevices(c.Request.Context(), userID, page, pageSize)
@@ -316,9 +317,9 @@ func (h *DeviceHandler) GetUserDevices(c *gin.Context) {
 	}
 
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
-	if pageSize < 1 || pageSize > 100 {
-		pageSize = 20
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
+	if pageSize < 1 || pageSize > pagination.MaxPageSize {
+		pageSize = pagination.DefaultPageSize
 	}
 
 	devices, total, err := h.deviceService.GetUserDevices(c.Request.Context(), userID, page, pageSize)
diff --git a/internal/api/handler/log_handler.go b/internal/api/handler/log_handler.go
index 65c2092..d3f6637 100644
--- a/internal/api/handler/log_handler.go
+++ b/internal/api/handler/log_handler.go
@@ -7,6 +7,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 
+	"github.com/user-management-system/internal/pagination"
 	"github.com/user-management-system/internal/service"
 )
 
@@ -43,9 +44,9 @@ func (h *LogHandler) GetMyLoginLogs(c *gin.Context) {
 	}
 
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
-	if pageSize < 1 || pageSize > 100 {
-		pageSize = 20
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
+	if pageSize < 1 || pageSize > pagination.MaxPageSize {
+		pageSize = pagination.DefaultPageSize
 	}
 
 	logs, total, err := h.loginLogService.GetMyLoginLogs(c.Request.Context(), userID, page, pageSize)
@@ -85,9 +86,9 @@ func (h *LogHandler) GetMyOperationLogs(c *gin.Context) {
 	}
 
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
-	if pageSize < 1 || pageSize > 100 {
-		pageSize = 20
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
+	if pageSize < 1 || pageSize > pagination.MaxPageSize {
+		pageSize = pagination.DefaultPageSize
 	}
 
 	logs, total, err := h.operationLogService.GetMyOperationLogs(c.Request.Context(), userID, page, pageSize)
diff --git a/internal/api/handler/user_handler.go b/internal/api/handler/user_handler.go
index 5a4a006..095bf16 100644
--- a/internal/api/handler/user_handler.go
+++ b/internal/api/handler/user_handler.go
@@ -10,6 +10,7 @@ import (
 	"github.com/user-management-system/internal/api/middleware"
 	"github.com/user-management-system/internal/auth"
 	"github.com/user-management-system/internal/domain"
+	"github.com/user-management-system/internal/pagination"
 	"github.com/user-management-system/internal/service"
 )
 
@@ -115,7 +116,7 @@ func (h *UserHandler) ListUsers(c *gin.Context) {
 
 	// Fallback to legacy offset-based pagination
 	offset, _ := strconv.ParseInt(c.DefaultQuery("offset", "0"), 10, 64)
-	limit, _ := strconv.ParseInt(c.DefaultQuery("limit", "20"), 10, 64)
+	limit, _ := strconv.ParseInt(c.DefaultQuery("limit", strconv.Itoa(pagination.DefaultPageSize)), 10, 64)
 
 	users, total, err := h.userService.List(c.Request.Context(), int(offset), int(limit))
 	if err != nil {
diff --git a/internal/api/handler/webhook_handler.go b/internal/api/handler/webhook_handler.go
index c7ec067..9c1c35a 100644
--- a/internal/api/handler/webhook_handler.go
+++ b/internal/api/handler/webhook_handler.go
@@ -6,6 +6,7 @@ import (
 
 	"github.com/gin-gonic/gin"
 
+	"github.com/user-management-system/internal/pagination"
 	"github.com/user-management-system/internal/service"
 )
 
@@ -66,12 +67,12 @@ func (h *WebhookHandler) CreateWebhook(c *gin.Context) {
 // @Router /api/v1/webhooks [get]
 func (h *WebhookHandler) ListWebhooks(c *gin.Context) {
 	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
-	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", strconv.Itoa(pagination.DefaultPageSize)))
 	if page < 1 {
 		page = 1
 	}
-	if pageSize < 1 || pageSize > 100 {
-		pageSize = 20
+	if pageSize < 1 || pageSize > pagination.MaxPageSize {
+		pageSize = pagination.DefaultPageSize
 	}
 	offset := (page - 1) * pageSize
 
@@ -178,9 +179,9 @@ func (h *WebhookHandler) GetWebhookDeliveries(c *gin.Context) {
 		return
 	}
 
-	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "20"))
-	if limit < 1 || limit > 100 {
-		limit = 20
+	limit, _ := strconv.Atoi(c.DefaultQuery("limit", strconv.Itoa(pagination.DefaultPageSize)))
+	if limit < 1 || limit > pagination.MaxPageSize {
+		limit = pagination.DefaultPageSize
 	}
 
 	deliveries, err := h.webhookService.GetWebhookDeliveries(c.Request.Context(), id, limit)
diff --git a/internal/repository/user.go b/internal/repository/user.go
index 402483c..e82308e 100644
--- a/internal/repository/user.go
+++ b/internal/repository/user.go
@@ -362,10 +362,10 @@ func (r *UserRepository) AdvancedSearch(ctx context.Context, filter *AdvancedFil
 	// 分页
 	limit := filter.Limit
 	if limit <= 0 {
-		limit = 20
+		limit = pagination.DefaultPageSize
 	}
-	if limit > 200 {
-		limit = 200
+	if limit > pagination.MaxPageSize {
+		limit = pagination.MaxPageSize
 	}
 	query = query.Offset(filter.Offset).Limit(limit)
 
diff --git a/internal/service/device.go b/internal/service/device.go
index 8507d03..8ea04a2 100644
--- a/internal/service/device.go
+++ b/internal/service/device.go
@@ -223,7 +223,7 @@ func (s *DeviceService) GetUserDevices(ctx context.Context, userID int64, page,
 		page = 1
 	}
 	if pageSize <= 0 {
-		pageSize = 20
+		pageSize = pagination.DefaultPageSize
 	}
 
 	offset := (page - 1) * pageSize
@@ -275,7 +275,7 @@ func (s *DeviceService) GetActiveDevices(ctx context.Context, page, pageSize int
 		page = 1
 	}
 	if pageSize <= 0 {
-		pageSize = 20
+		pageSize = pagination.DefaultPageSize
 	}
 
 	offset := (page - 1) * pageSize
diff --git a/internal/service/login_log.go b/internal/service/login_log.go
index ff542ff..5be6138 100644
--- a/internal/service/login_log.go
+++ b/internal/service/login_log.go
@@ -228,7 +228,7 @@ func (s *LoginLogService) GetMyLoginLogs(ctx context.Context, userID int64, page
 		page = 1
 	}
 	if pageSize <= 0 {
-		pageSize = 20
+		pageSize = pagination.DefaultPageSize
 	}
 	offset := (page - 1) * pageSize
 	return s.loginLogRepo.ListByUserID(ctx, userID, offset, pageSize)
diff --git a/internal/service/operation_log.go b/internal/service/operation_log.go
index 5f1b816..703a56f 100644
--- a/internal/service/operation_log.go
+++ b/internal/service/operation_log.go
@@ -143,7 +143,7 @@ func (s *OperationLogService) GetMyOperationLogs(ctx context.Context, userID int
 		page = 1
 	}
 	if pageSize <= 0 {
-		pageSize = 20
+		pageSize = pagination.DefaultPageSize
 	}
 	offset := (page - 1) * pageSize
 	return s.operationLogRepo.ListByUserID(ctx, userID, offset, pageSize)