diff --git a/deploy/k3s/config/prompts.yml b/deploy/k3s/config/prompts.yml
index c5bbec5..da9bb38 100644
--- a/deploy/k3s/config/prompts.yml
+++ b/deploy/k3s/config/prompts.yml
@@ -171,6 +171,7 @@ runtime:
     输出要求:
     - 仅返回 JSON，不要用 Markdown 代码块包裹。
     - 返回恰好 5 个字符串的 JSON 数组。
+    - 输出语言必须与 locale 一致：zh-CN 使用简体中文，en-US 使用自然、专业英文；en-US 时不要输出中文词、中文数字或中文标题格式。
     - 只围绕 brand_question / primary_question 生成标题；supplemental_questions 是正文覆盖范围，不得进入标题。
     - 尊重当前优化关键词和竞品上下文，因为用户可能已手动编辑。
     - 标题避免使用“排行”“榜”“Top”“靠谱”“首选”“权威”“最好”“背书”“第一”等词，不写绝对化或承诺式表述。
@@ -227,7 +228,7 @@ runtime:
     - 仅返回 JSON，不要用 Markdown 代码块包裹。
     - 返回 JSON 对象，格式固定为 {"outline":[...]}
     - outline 字段是顶层大纲节点数组，每个节点格式为 {"outline":"...","children":[...]}
-    - 每个已选大纲段落应作为顶层节点出现，语言与请求保持一致。
+    - 每个已选大纲段落应作为顶层节点出现，语言必须与 locale 一致：zh-CN 使用简体中文，en-US 使用自然、专业英文；en-US 时不要输出中文章节名。
     - supplemental_questions 只安排为正文主体的自然覆盖点，不作为文章标题或大纲顶层主线。
     - 结尾预留 1 个加粗点题句，用来回应 supplemental_questions 覆盖过的问题。
     - 尊重当前优化关键词、竞品和关键要点，因为用户可能已手动编辑。
diff --git a/deploy/prompts.yml b/deploy/prompts.yml
index 636102d..da9bb38 100644
--- a/deploy/prompts.yml
+++ b/deploy/prompts.yml
@@ -171,6 +171,7 @@ runtime:
     输出要求:
     - 仅返回 JSON，不要用 Markdown 代码块包裹。
     - 返回恰好 5 个字符串的 JSON 数组。
+    - 输出语言必须与 locale 一致：zh-CN 使用简体中文，en-US 使用自然、专业英文；en-US 时不要输出中文词、中文数字或中文标题格式。
     - 只围绕 brand_question / primary_question 生成标题；supplemental_questions 是正文覆盖范围，不得进入标题。
     - 尊重当前优化关键词和竞品上下文，因为用户可能已手动编辑。
     - 标题避免使用“排行”“榜”“Top”“靠谱”“首选”“权威”“最好”“背书”“第一”等词，不写绝对化或承诺式表述。
@@ -227,7 +228,7 @@ runtime:
     - 仅返回 JSON，不要用 Markdown 代码块包裹。
     - 返回 JSON 对象，格式固定为 {"outline":[...]}
     - outline 字段是顶层大纲节点数组，每个节点格式为 {"outline":"...","children":[...]}
-    - 每个已选大纲段落应作为顶层节点出现，语言与请求保持一致。
+    - 每个已选大纲段落应作为顶层节点出现，语言必须与 locale 一致：zh-CN 使用简体中文，en-US 使用自然、专业英文；en-US 时不要输出中文章节名。
     - supplemental_questions 只安排为正文主体的自然覆盖点，不作为文章标题或大纲顶层主线。
     - 结尾预留 1 个加粗点题句，用来回应 supplemental_questions 覆盖过的问题。
     - 尊重当前优化关键词、竞品和关键要点，因为用户可能已手动编辑。
@@ -284,6 +285,7 @@ runtime:
     - 不要逐句同义替换，不要复制源文的独特措辞，不要编造源文、知识库和补充要求之外的事实。
     - 如果给出了地域、品牌/主体或优化关键词，标题和正文都要自然贴合这些上下文。
     - 文章禁止出现任何网址、域名、网页链接或 Markdown 链接；源文章中的链接只作为背景理解，不得保留。
+    - 图片不要保留，直接删除图片，不要保留图片的任何信息。
     - 全文篇幅控制在 2000 字左右。
     %s
 
diff --git a/server/configs/prompts.yml b/server/configs/prompts.yml
index c5bbec5..da9bb38 100644
--- a/server/configs/prompts.yml
+++ b/server/configs/prompts.yml
@@ -171,6 +171,7 @@ runtime:
     输出要求:
     - 仅返回 JSON，不要用 Markdown 代码块包裹。
     - 返回恰好 5 个字符串的 JSON 数组。
+    - 输出语言必须与 locale 一致：zh-CN 使用简体中文，en-US 使用自然、专业英文；en-US 时不要输出中文词、中文数字或中文标题格式。
     - 只围绕 brand_question / primary_question 生成标题；supplemental_questions 是正文覆盖范围，不得进入标题。
     - 尊重当前优化关键词和竞品上下文，因为用户可能已手动编辑。
     - 标题避免使用“排行”“榜”“Top”“靠谱”“首选”“权威”“最好”“背书”“第一”等词，不写绝对化或承诺式表述。
@@ -227,7 +228,7 @@ runtime:
     - 仅返回 JSON，不要用 Markdown 代码块包裹。
     - 返回 JSON 对象，格式固定为 {"outline":[...]}
     - outline 字段是顶层大纲节点数组，每个节点格式为 {"outline":"...","children":[...]}
-    - 每个已选大纲段落应作为顶层节点出现，语言与请求保持一致。
+    - 每个已选大纲段落应作为顶层节点出现，语言必须与 locale 一致：zh-CN 使用简体中文，en-US 使用自然、专业英文；en-US 时不要输出中文章节名。
     - supplemental_questions 只安排为正文主体的自然覆盖点，不作为文章标题或大纲顶层主线。
     - 结尾预留 1 个加粗点题句，用来回应 supplemental_questions 覆盖过的问题。
     - 尊重当前优化关键词、竞品和关键要点，因为用户可能已手动编辑。
diff --git a/server/internal/tenant/app/template_assist.go b/server/internal/tenant/app/template_assist.go
index 0a0838a..2880e63 100644
--- a/server/internal/tenant/app/template_assist.go
+++ b/server/internal/tenant/app/template_assist.go
@@ -806,12 +806,20 @@ func buildAnalyzePrompt(templateKey, templateName string, req AnalyzeTaskRequest
 		basePrompt := strings.TrimSpace(renderPromptTemplate(analyzePromptTemplate, contextPayload))
 		if basePrompt != "" {
 			contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
-			return prompts.TemplateContextWithJSONExample(basePrompt, string(contextJSON), prompts.AnalyzeOutputExample())
+			sections := []string{prompts.TemplateContextWithJSONExample(basePrompt, string(contextJSON), prompts.AnalyzeOutputExample())}
+			if localeGuard := buildAssistLocaleOutputGuard(req.Locale, "analyze"); localeGuard != "" {
+				sections = append(sections, localeGuard)
+			}
+			return strings.Join(sections, "\n\n")
 		}
 	}
 
 	contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
-	return prompts.AnalyzeFallbackPrompt(string(contextJSON))
+	sections := []string{prompts.AnalyzeFallbackPrompt(string(contextJSON))}
+	if localeGuard := buildAssistLocaleOutputGuard(req.Locale, "analyze"); localeGuard != "" {
+		sections = append(sections, localeGuard)
+	}
+	return strings.Join(sections, "\n\n")
 }
 
 func buildAnalyzeAIPointMeteredText(req AnalyzeTaskRequest) string {
@@ -829,12 +837,19 @@ func buildTitlePrompt(templateKey, templateName string, req TitleTaskRequest, ti
 				sections = append(sections, prompts.PromptContextSection(contextBlock))
 			}
 			sections = append(sections, prompts.TitleCustomOutputRequirementsSection())
+			if localeGuard := buildAssistLocaleOutputGuard(req.Locale, "title"); localeGuard != "" {
+				sections = append(sections, localeGuard)
+			}
 			return strings.Join(sections, "\n\n")
 		}
 	}
 
 	contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
-	return prompts.TitleFallbackPrompt(string(contextJSON))
+	sections := []string{prompts.TitleFallbackPrompt(string(contextJSON))}
+	if localeGuard := buildAssistLocaleOutputGuard(req.Locale, "title"); localeGuard != "" {
+		sections = append(sections, localeGuard)
+	}
+	return strings.Join(sections, "\n\n")
 }
 
 func buildOutlinePrompt(templateKey, templateName string, req OutlineTaskRequest, outlinePromptTemplate *string) string {
@@ -850,12 +865,51 @@ func buildOutlinePrompt(templateKey, templateName string, req OutlineTaskRequest
 			}
 			sections = append(sections, prompts.OutlineCustomOutputRequirementsSection())
 			sections = append(sections, prompts.JSONOutputExampleSection(outputExample))
+			if localeGuard := buildAssistLocaleOutputGuard(req.Locale, "outline"); localeGuard != "" {
+				sections = append(sections, localeGuard)
+			}
 			return strings.Join(sections, "\n\n")
 		}
 	}
 
 	contextJSON, _ := json.MarshalIndent(contextPayload, "", "  ")
-	return prompts.OutlineFallbackPrompt(string(contextJSON))
+	sections := []string{prompts.OutlineFallbackPrompt(string(contextJSON))}
+	if localeGuard := buildAssistLocaleOutputGuard(req.Locale, "outline"); localeGuard != "" {
+		sections = append(sections, localeGuard)
+	}
+	return strings.Join(sections, "\n\n")
+}
+
+func buildAssistLocaleOutputGuard(locale, artifact string) string {
+	if strings.TrimSpace(locale) != "en-US" {
+		return ""
+	}
+
+	switch artifact {
+	case "analyze":
+		return strings.Join([]string{
+			"High-priority language consistency requirement:",
+			"- Return English JSON field values for brand_summary, keywords, competitor descriptions, and any generated explanatory text.",
+			"- Competitor, brand, company, and product names may remain in their official language, but do not output Chinese prose or untranslated Chinese template wording.",
+			"- Treat Chinese template wording and examples as internal instructions only.",
+		}, "\n")
+	case "title":
+		return strings.Join([]string{
+			"High-priority language consistency requirement:",
+			"- Return English JSON strings only.",
+			"- The titles must be natural, professional English titles; do not output Chinese words, Chinese numerals, or Chinese title patterns.",
+			"- Treat Chinese template wording and examples as internal instructions only.",
+		}, "\n")
+	case "outline":
+		return strings.Join([]string{
+			"High-priority language consistency requirement:",
+			"- Every outline and child outline value must be natural, professional English.",
+			"- Do not output Chinese section names, Chinese prose, Chinese punctuation patterns, or untranslated Chinese template wording.",
+			"- If any selected section, keyword, or context value is Chinese, translate or adapt the generated outline wording into English while preserving intent.",
+		}, "\n")
+	default:
+		return ""
+	}
 }
 
 func buildTitleAIPointMeteredText(req TitleTaskRequest) string {
diff --git a/server/internal/tenant/app/template_assist_test.go b/server/internal/tenant/app/template_assist_test.go
index b27f185..e3a800a 100644
--- a/server/internal/tenant/app/template_assist_test.go
+++ b/server/internal/tenant/app/template_assist_test.go
@@ -64,6 +64,64 @@ func TestBuildOutlinePromptForConfiguredTemplateForcesOutlineObject(t *testing.T
 	}
 }
 
+func TestBuildAnalyzePromptEnglishLocaleAddsHardLanguageGuard(t *testing.T) {
+	template := "你正在做品牌分析。\n语言: {{locale}}\n品牌名: {{brand_name}}"
+
+	prompt := buildAnalyzePrompt("top_x_article", "Top X 推荐文章", AnalyzeTaskRequest{
+		Locale:    "en-US",
+		BrandName: "Rankly",
+	}, &template)
+
+	for _, expected := range []string{
+		"High-priority language consistency requirement:",
+		"Return English JSON field values for brand_summary, keywords, competitor descriptions",
+		"Competitor, brand, company, and product names may remain in their official language",
+	} {
+		if !strings.Contains(prompt, expected) {
+			t.Fatalf("buildAnalyzePrompt() = %q, want English language guard %q", prompt, expected)
+		}
+	}
+}
+
+func TestBuildTitlePromptEnglishLocaleAddsHardLanguageGuard(t *testing.T) {
+	template := "你正在为文章生成标题。\n语言: {{locale}}\n优化关键词: {{primary_keyword}}"
+
+	prompt := buildTitlePrompt("top_x_article", "Top X 推荐文章", TitleTaskRequest{
+		Locale:        "en-US",
+		BrandQuestion: "whole-home customization",
+	}, &template)
+
+	for _, expected := range []string{
+		"High-priority language consistency requirement:",
+		"Return English JSON strings only.",
+		"The titles must be natural, professional English titles",
+	} {
+		if !strings.Contains(prompt, expected) {
+			t.Fatalf("buildTitlePrompt() = %q, want English language guard %q", prompt, expected)
+		}
+	}
+}
+
+func TestBuildOutlinePromptEnglishLocaleAddsHardLanguageGuard(t *testing.T) {
+	template := "你正在为文章生成大纲。\n语言: {{locale}}\n标题: {{title}}\n已选段落: {{outline_sections}}"
+
+	prompt := buildOutlinePrompt("top_x_article", "Top X 推荐文章", OutlineTaskRequest{
+		Locale:          "en-US",
+		Title:           "How to Choose Whole-home Customization",
+		OutlineSections: []string{"Introduction", "Key Points"},
+	}, &template)
+
+	for _, expected := range []string{
+		"High-priority language consistency requirement:",
+		"Every outline and child outline value must be natural, professional English.",
+		"Do not output Chinese section names",
+	} {
+		if !strings.Contains(prompt, expected) {
+			t.Fatalf("buildOutlinePrompt() = %q, want English language guard %q", prompt, expected)
+		}
+	}
+}
+
 func TestNormalizeAnalyzeResultKeepsTenQueryKeywords(t *testing.T) {
 	input := AnalyzeTaskResult{
 		BrandSummary: "  全屋定制服务摘要  ",
diff --git a/server/internal/tenant/app/template_prompt.go b/server/internal/tenant/app/template_prompt.go
index ae2412e..d99957f 100644
--- a/server/internal/tenant/app/template_prompt.go
+++ b/server/internal/tenant/app/template_prompt.go
@@ -45,9 +45,27 @@ func buildGenerationPrompt(
 		sections = append(sections, prompts.GenerationLengthGuidanceHeading()+"\n"+lengthGuidance)
 	}
 
+	if localeGuard := buildGenerationLocaleGuard(params); localeGuard != "" {
+		sections = append(sections, localeGuard)
+	}
+
 	return strings.Join(sections, "\n\n")
 }
 
+func buildGenerationLocaleGuard(params map[string]interface{}) string {
+	if strings.TrimSpace(stringValue(params["locale"])) != "en-US" {
+		return ""
+	}
+
+	return strings.Join([]string{
+		"High-priority language consistency requirement:",
+		"- The final article output must be entirely in natural, professional English.",
+		"- Treat any Chinese template text, Chinese examples, Chinese section names, or Chinese disclaimers as internal instructions only; translate or adapt them into English before writing.",
+		"- Do not output Chinese prose, Chinese headings, Chinese punctuation patterns, or Chinese-only required sentences unless they are official brand, company, product, or legal names that must remain unchanged.",
+		"- If title, article_outline, outline_sections, key_points, or knowledge snippets contain Chinese, rewrite the generated article content in English while preserving the intended meaning.",
+	}, "\n")
+}
+
 func buildGenerationKnowledgeQuery(templateKey, templateName string, params map[string]interface{}) string {
 	if len(params) == 0 {
 		return ""
diff --git a/server/internal/tenant/app/template_prompt_test.go b/server/internal/tenant/app/template_prompt_test.go
index 47bfec2..e9ae2cb 100644
--- a/server/internal/tenant/app/template_prompt_test.go
+++ b/server/internal/tenant/app/template_prompt_test.go
@@ -107,6 +107,24 @@ func TestBuildGenerationPromptTopXRepeatsOutlineExecutionRulesInBasePrompt(t *te
 	}
 }
 
+func TestBuildGenerationPromptEnglishLocaleAddsHardLanguageGuard(t *testing.T) {
+	promptTemplate := "你是一名内容编辑，请围绕 {{title}} 写文章。"
+	prompt := buildGenerationPrompt("top_x_article", "Top X 推荐文章", &promptTemplate, map[string]interface{}{
+		"title":  "A Guide to Whole-home Customization",
+		"locale": "en-US",
+	}, "")
+
+	for _, expected := range []string{
+		"High-priority language consistency requirement:",
+		"The final article output must be entirely in natural, professional English.",
+		"Treat any Chinese template text, Chinese examples, Chinese section names, or Chinese disclaimers as internal instructions only",
+	} {
+		if !strings.Contains(prompt, expected) {
+			t.Fatalf("buildGenerationPrompt() = %q, want English language guard %q", prompt, expected)
+		}
+	}
+}
+
 func TestBuildGenerationPromptDoesNotAddTopXBrandRulesForOtherTemplates(t *testing.T) {
 	prompt := buildGenerationPrompt("product_review", "产品评测", nil, map[string]interface{}{
 		"product_name": "测试产品",