diff --git a/apps/admin-web/src/lib/api.ts b/apps/admin-web/src/lib/api.ts
index 8fd857e..875f711 100644
--- a/apps/admin-web/src/lib/api.ts
+++ b/apps/admin-web/src/lib/api.ts
@@ -703,6 +703,9 @@ export const knowledgeApi = {
   removeItem(id: number) {
     return apiClient.remove<null>(`/api/tenant/knowledge/items/${id}`);
   },
+  retryItem(id: number) {
+    return apiClient.post<KnowledgeItem, null>(`/api/tenant/knowledge/items/retry/${id}`, null);
+  },
 };
 
 export const imagesApi = {
diff --git a/apps/admin-web/src/lib/errors.ts b/apps/admin-web/src/lib/errors.ts
index 97beb01..a641725 100644
--- a/apps/admin-web/src/lib/errors.ts
+++ b/apps/admin-web/src/lib/errors.ts
@@ -53,6 +53,7 @@ const errorMessageMap: Record<string, string> = {
   keyword_exists: "关键词已存在",
   keyword_limit_reached: "关键词数量已达当前套餐上限",
   question_limit_reached: "当前关键词下的问题数量已达上限",
+  knowledge_text_name_too_long: "文本名称不能超过 20 个字",
   brand_not_found: "品牌不存在或已删除",
   keyword_not_found: "关键词不存在或已删除",
   publish_cover_required: "当前选择的平台要求上传封面图，请先上传封面图",
diff --git a/apps/admin-web/src/views/KnowledgeView.vue b/apps/admin-web/src/views/KnowledgeView.vue
index f8afc04..2f9ceeb 100644
--- a/apps/admin-web/src/views/KnowledgeView.vue
+++ b/apps/admin-web/src/views/KnowledgeView.vue
@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { DeleteOutlined, EyeOutlined, MoreOutlined, PlusOutlined, UploadOutlined } from "@ant-design/icons-vue";
+import { DeleteOutlined, EyeOutlined, MoreOutlined, PlusOutlined, ReloadOutlined, UploadOutlined } from "@ant-design/icons-vue";
 import { useMutation, useQuery, useQueryClient } from "@tanstack/vue-query";
 import { message, Modal, type TableColumnsType, type UploadProps } from "ant-design-vue";
 import type { KnowledgeGroup, KnowledgeItem } from "@geo/shared-types";
@@ -13,6 +13,7 @@ import { formatError } from "@/lib/errors";
 type KnowledgeSourceType = "document" | "website" | "text";
 type KnowledgeGroupLevel = "root" | "child";
 const MAX_WEBSITE_URLS = 3;
+const MAX_TEXT_NAME_LENGTH = 20;
 
 interface TreeNode {
   title: string;
@@ -62,7 +63,7 @@ const columns: TableColumnsType<KnowledgeItem> = [
   { title: "大小", dataIndex: "size_bytes", key: "size_bytes", width: 120 },
   { title: "AI学习", dataIndex: "status", key: "status", width: 120 },
   { title: "上传时间", dataIndex: "created_at", key: "created_at", width: 180 },
-  { title: "操作", key: "actions", width: 120, fixed: "right", align: "right" },
+  { title: "操作", key: "actions", width: 160, fixed: "right", align: "right" },
 ];
 
 const rootGroups = computed(() => groupsQuery.data.value ?? []);
@@ -177,6 +178,10 @@ const itemMutation = useMutation({
       if (validTexts.length === 0) {
         throw new Error("请至少输入一项完整的文本内容");
       }
+      const oversizedText = validTexts.find((item) => [...item.name.trim()].length > MAX_TEXT_NAME_LENGTH);
+      if (oversizedText) {
+        throw new Error(`文本名称不能超过 ${MAX_TEXT_NAME_LENGTH} 个字`);
+      }
       for (const txt of validTexts) {
         promises.push(
           knowledgeApi.createTextItem({
@@ -227,6 +232,15 @@ const deleteItemMutation = useMutation({
   onError: (error) => message.error(formatError(error)),
 });
 
+const retryItemMutation = useMutation({
+  mutationFn: (id: number) => knowledgeApi.retryItem(id),
+  onSuccess: async () => {
+    message.success("已重新提交学习");
+    await queryClient.invalidateQueries({ queryKey: ["knowledge"] });
+  },
+  onError: (error) => message.error(formatError(error)),
+});
+
 watch(
   () => groupsQuery.data.value,
   (groups) => {
@@ -486,6 +500,22 @@ function formatStatus(value: string): string {
   }
 }
 
+function statusColor(value: string): string {
+  switch (value) {
+    case "completed":
+      return "success";
+    case "failed":
+      return "error";
+    case "processing":
+    case "pending":
+      return "processing";
+    case "deleted":
+      return "default";
+    default:
+      return "default";
+  }
+}
+
 function formatSize(value: number): string {
   if (value < 1024) return `${value} B`;
   if (value < 1024 * 1024) return `${(value / 1024).toFixed(1)} KB`;
@@ -582,15 +612,27 @@ function closeItemDetail(): void {
                 {{ formatSize(record.size_bytes) }}
               </template>
               <template v-else-if="column.key === 'status'">
-                <span class="knowledge-status-text">
+                <a-tag :color="statusColor(record.status)" class="knowledge-status-tag">
                   {{ formatStatus(record.status) }}
-                </span>
+                </a-tag>
               </template>
               <template v-else-if="column.key === 'created_at'">
                 {{ formatDateTime(record.created_at) }}
               </template>
               <template v-else-if="column.key === 'actions'">
                 <div class="table-actions-row">
+                  <a-tooltip v-if="record.status === 'failed'" title="重试">
+                    <a-button
+                      type="text"
+                      shape="circle"
+                      size="small"
+                      class="action-btn action-retry"
+                      :loading="retryItemMutation.isPending.value && retryItemMutation.variables.value === record.id"
+                      @click="retryItemMutation.mutate(record.id)"
+                    >
+                      <ReloadOutlined />
+                    </a-button>
+                  </a-tooltip>
                   <a-tooltip title="查看">
                     <a-button type="text" shape="circle" size="small" class="action-btn action-eye" @click="openItemDetail(record.id)">
                       <EyeOutlined />
@@ -698,7 +740,13 @@ function closeItemDetail(): void {
             <div v-for="(txt, index) in textItems" :key="index" class="text-item-box">
               <div class="text-item-row">
                 <span class="text-item-label">文本名称：</span>
-                <a-input v-model:value="txt.name" placeholder="请输入文本名称" style="flex: 1;" />
+                <a-input
+                  v-model:value="txt.name"
+                  :maxlength="MAX_TEXT_NAME_LENGTH"
+                  show-count
+                  placeholder="请输入文本名称"
+                  style="flex: 1;"
+                />
               </div>
               <div class="text-item-row">
                 <span class="text-item-label">文本内容：</span>
@@ -793,7 +841,7 @@ function closeItemDetail(): void {
 }
 
 .knowledge-sidebar__add {
-  color: #666;
+  color: #1677ff;
   font-size: 13px;
   cursor: pointer;
   display: flex;
@@ -802,7 +850,7 @@ function closeItemDetail(): void {
 }
 
 .knowledge-sidebar__add:hover {
-  color: #1677ff;
+  color: #4096ff;
 }
 
 .tree-node-wrapper {
@@ -836,8 +884,31 @@ function closeItemDetail(): void {
   color: #1677ff;
 }
 
-.knowledge-status-text {
-  color: #6b7280;
+:deep(.ant-tree) {
+  width: 100%;
+}
+
+:deep(.ant-tree-treenode) {
+  width: 100%;
+  padding-bottom: 4px;
+}
+
+:deep(.ant-tree-node-content-wrapper) {
+  flex: 1 1 auto;
+  min-width: 0;
+  min-height: 36px;
+  display: flex;
+  align-items: center;
+}
+
+:deep(.ant-tree-title) {
+  flex: 1;
+  min-width: 0;
+}
+
+.knowledge-status-tag {
+  margin-inline-end: 0;
+  font-weight: 500;
 }
 
 /* Actions */
@@ -852,6 +923,7 @@ function closeItemDetail(): void {
   color: #8c8c8c;
   font-size: 14px;
 }
+.action-retry:hover { color: #1677ff; background: #e6f4ff; }
 .action-eye:hover { color: #13c2c2; background: #e6fffb; }
 .action-delete:hover { color: #ff4d4f; background: #fff2f0; }
 
diff --git a/server/internal/tenant/app/knowledge_service.go b/server/internal/tenant/app/knowledge_service.go
index 152797a..5508551 100644
--- a/server/internal/tenant/app/knowledge_service.go
+++ b/server/internal/tenant/app/knowledge_service.go
@@ -12,6 +12,7 @@ import (
 	"strings"
 	"sync"
 	"time"
+	"unicode/utf8"
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5"
@@ -32,6 +33,7 @@ const (
 	defaultKnowledgeCleanupPoll    = 15 * time.Second
 	defaultKnowledgeChildGroupName = "默认目录"
 	maxKnowledgeSnippetsPerItem    = 2
+	maxKnowledgeTextNameRunes      = 20
 )
 
 type KnowledgeService struct {
@@ -598,9 +600,14 @@ func (s *KnowledgeService) CreateTextItem(ctx context.Context, req KnowledgeText
 		return nil, response.ErrBadRequest(40051, "knowledge_content_required", "knowledge content is required")
 	}
 
+	name := strings.TrimSpace(req.Name)
+	if utf8.RuneCountInString(name) > maxKnowledgeTextNameRunes {
+		return nil, response.ErrBadRequest(40055, "knowledge_text_name_too_long", "knowledge text name must be at most 20 characters")
+	}
+
 	return s.queueKnowledgeItem(ctx, actor.TenantID, knowledgeIngestInput{
 		GroupID:     req.GroupID,
-		Name:        strings.TrimSpace(req.Name),
+		Name:        name,
 		SourceType:  "text",
 		ContentText: &content,
 		SizeBytes:   int64(len([]byte(content))),
@@ -715,6 +722,100 @@ func (s *KnowledgeService) DeleteItem(ctx context.Context, itemID int64) error {
 	return nil
 }
 
+func (s *KnowledgeService) RetryItem(ctx context.Context, itemID int64) (*KnowledgeItemResponse, error) {
+	actor := auth.MustActor(ctx)
+
+	var sourceType string
+	var status string
+	err := s.pool.QueryRow(ctx, `
+		SELECT source_type, status
+		FROM knowledge_items
+		WHERE id = $1 AND tenant_id = $2 AND deleted_at IS NULL
+	`, itemID, actor.TenantID).Scan(&sourceType, &status)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, response.ErrNotFound(40450, "knowledge_item_not_found", "knowledge item not found")
+		}
+		return nil, response.ErrInternal(50051, "knowledge_items_query_failed", "failed to load knowledge item")
+	}
+	if status != "failed" {
+		return nil, response.ErrConflict(40952, "knowledge_item_retry_unavailable", "only failed knowledge items can be retried")
+	}
+	if err := s.validateIngestionDependencies(sourceType); err != nil {
+		return nil, err
+	}
+
+	tx, err := s.pool.Begin(ctx)
+	if err != nil {
+		return nil, response.ErrInternal(50055, "knowledge_item_retry_failed", "failed to begin retry transaction")
+	}
+	defer func() { _ = tx.Rollback(ctx) }()
+
+	var parseTaskID int64
+	err = tx.QueryRow(ctx, `
+		UPDATE knowledge_parse_tasks
+		SET status = 'pending',
+		    error_message = NULL,
+		    started_at = NULL,
+		    completed_at = NULL,
+		    updated_at = NOW()
+		WHERE id = (
+			SELECT id
+			FROM knowledge_parse_tasks
+			WHERE tenant_id = $1
+			  AND knowledge_item_id = $2
+			ORDER BY created_at DESC, id DESC
+			LIMIT 1
+		)
+		RETURNING id
+	`, actor.TenantID, itemID).Scan(&parseTaskID)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return nil, response.ErrConflict(40952, "knowledge_item_retry_unavailable", "knowledge parse task is unavailable")
+		}
+		return nil, response.ErrInternal(50055, "knowledge_item_retry_failed", "failed to reset knowledge parse task")
+	}
+
+	tag, err := tx.Exec(ctx, `
+		UPDATE knowledge_items
+		SET status = 'pending',
+		    error_message = NULL,
+		    updated_at = NOW()
+		WHERE id = $1
+		  AND tenant_id = $2
+		  AND deleted_at IS NULL
+		  AND status = 'failed'
+	`, itemID, actor.TenantID)
+	if err != nil {
+		return nil, response.ErrInternal(50055, "knowledge_item_retry_failed", "failed to reset knowledge item")
+	}
+	if tag.RowsAffected() == 0 {
+		return nil, response.ErrConflict(40952, "knowledge_item_retry_unavailable", "only failed knowledge items can be retried")
+	}
+
+	if err := tx.Commit(ctx); err != nil {
+		return nil, response.ErrInternal(50055, "knowledge_item_retry_failed", "failed to commit retry transaction")
+	}
+
+	if err := s.enqueueParseJob(knowledgeParseJob{
+		TenantID:    actor.TenantID,
+		ItemID:      itemID,
+		ParseTaskID: parseTaskID,
+	}); err != nil {
+		_ = s.markKnowledgeIngestionFailed(context.Background(), actor.TenantID, itemID, parseTaskID, err)
+		return nil, response.ErrServiceUnavailable(50356, "knowledge_queue_unavailable", "knowledge parse queue is busy, please retry")
+	}
+
+	items, err := s.listKnowledgeItemsByIDs(ctx, actor.TenantID, []int64{itemID})
+	if err != nil {
+		return nil, err
+	}
+	if len(items) == 0 {
+		return nil, response.ErrNotFound(40450, "knowledge_item_not_found", "knowledge item not found")
+	}
+	return &items[0], nil
+}
+
 func (s *KnowledgeService) ResolveContext(
 	ctx context.Context,
 	tenantID int64,
diff --git a/server/internal/tenant/transport/knowledge_handler.go b/server/internal/tenant/transport/knowledge_handler.go
index 8014c79..304fc72 100644
--- a/server/internal/tenant/transport/knowledge_handler.go
+++ b/server/internal/tenant/transport/knowledge_handler.go
@@ -190,6 +190,21 @@ func (h *KnowledgeHandler) CreateFileItem(c *gin.Context) {
 	response.SuccessWithStatus(c, http.StatusCreated, data)
 }
 
+func (h *KnowledgeHandler) RetryItem(c *gin.Context) {
+	itemID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		response.Error(c, response.ErrBadRequest(40001, "invalid_id", "knowledge item id must be a number"))
+		return
+	}
+
+	data, err := h.svc.RetryItem(c.Request.Context(), itemID)
+	if err != nil {
+		response.Error(c, err)
+		return
+	}
+	response.Success(c, data)
+}
+
 func (h *KnowledgeHandler) DeleteItem(c *gin.Context) {
 	itemID, err := strconv.ParseInt(c.Param("id"), 10, 64)
 	if err != nil {
diff --git a/server/internal/tenant/transport/router.go b/server/internal/tenant/transport/router.go
index 4a6e576..d4b75a1 100644
--- a/server/internal/tenant/transport/router.go
+++ b/server/internal/tenant/transport/router.go
@@ -199,6 +199,7 @@ func RegisterRoutes(app *bootstrap.App) {
 	knowledge.POST("/items/text", knowledgeHandler.CreateTextItem)
 	knowledge.POST("/items/url", knowledgeHandler.CreateURLItem)
 	knowledge.POST("/items/file", knowledgeHandler.CreateFileItem)
+	knowledge.POST("/items/retry/:id", knowledgeHandler.RetryItem)
 	knowledge.DELETE("/items/:id", knowledgeHandler.DeleteItem)
 
 	// Prompt Rules