diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/AiServiceClient.java b/src/main/java/com/guo/learningprogresstracker/service/impl/AiServiceClient.java
index f0ddbf0..7955c70 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/AiServiceClient.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/impl/AiServiceClient.java
@@ -89,4 +89,44 @@ public class AiServiceClient {
             return Optional.empty();
         }
     }
+
+    /**
+     * 调用 lpt-ai 从学习数据生成思维导图大纲（缩进文本格式）。
+     *
+     * @return 缩进大纲文本；服务未配置或调用失败时返回 empty
+     */
+    public Optional<String> generateMindMap(String taskName, String taskDescription,
+                                             List<String> reports, List<String> fragments) {
+        if (!isConfigured()) {
+            return Optional.empty();
+        }
+        try {
+            Map<String, Object> body = Map.of(
+                    "taskName", taskName,
+                    "taskDescription", taskDescription != null ? taskDescription : "",
+                    "reports", reports != null ? reports : List.of(),
+                    "fragments", fragments != null ? fragments : List.of()
+            );
+
+            HttpRequest request = HttpRequest.newBuilder()
+                    .uri(URI.create(url + "/ai/generate-mind-map"))
+                    .timeout(Duration.ofSeconds(timeoutSeconds))
+                    .header("Content-Type", "application/json")
+                    .POST(HttpRequest.BodyPublishers.ofString(objectMapper.writeValueAsString(body)))
+                    .build();
+
+            HttpResponse<String> response = httpClient.send(request, HttpResponse.BodyHandlers.ofString());
+            if (response.statusCode() != 200) {
+                log.warn("lpt-ai 生成思维导图失败: status={}, body={}", response.statusCode(),
+                        response.body() != null ? response.body().substring(0, Math.min(200, response.body().length())) : "");
+                return Optional.empty();
+            }
+            JsonNode json = objectMapper.readTree(response.body());
+            String outline = json.path("outline").asText(null);
+            return Optional.ofNullable(outline).filter(s -> !s.isBlank());
+        } catch (Exception e) {
+            log.warn("lpt-ai 思维导图调用异常，将降级: {}", e.getMessage());
+            return Optional.empty();
+        }
+    }
 }
diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClient.java b/src/main/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClient.java
index 7b22be8..9de5dc9 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClient.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/impl/RemoteAiMindMapClient.java
@@ -6,55 +6,35 @@ import com.guo.learningprogresstracker.entity.TaskApplicationEntity;
 import com.guo.learningprogresstracker.entity.TaskEntity;
 import com.guo.learningprogresstracker.service.MindMapAiClient;
 import com.guo.learningprogresstracker.utils.MindMapNode;
-import jakarta.annotation.PostConstruct;
-import lombok.Setter;
+import com.guo.learningprogresstracker.utils.MindMapTreeTool;
+import lombok.RequiredArgsConstructor;
 import lombok.extern.slf4j.Slf4j;
-import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.stereotype.Component;
 
 import java.util.List;
 import java.util.Optional;
+import java.util.stream.Collectors;
 
 /**
- * 远程 AI 思维导图生成客户端（预留实现）。
- * <p>通过 {@code lpt.ai.endpoint} / {@code lpt.ai.api-key} 配置；未配置时不可用，
- * 上层服务会回退到 {@link BuiltinMindMapGenerator}。</p>
+ * 远程 AI 思维导图生成客户端。
+ * <p>通过 lpt-ai 服务（{@code lpt.ai-service.url}）调用大语言模型生成思维导图。
+ * 未配置 lpt-ai 时不可用，会回退到 {@link BuiltinMindMapGenerator}。</p>
  */
 @Slf4j
 @Component
-@ConfigurationProperties(prefix = "lpt.ai")
-@Setter
+@RequiredArgsConstructor
 public class RemoteAiMindMapClient implements MindMapAiClient {
 
-    /** AI 服务端点 */
-    private String endpoint;
-    /** API Key */
-    private String apiKey;
-    /** 模型名称 */
-    private String model = "claude-fable-5";
-    /** 超时秒数 */
-    private int timeoutSeconds = 60;
-
-    private boolean enabled = false;
-
-    @PostConstruct
-    void init() {
-        enabled = apiKey != null && !apiKey.isBlank() && endpoint != null && !endpoint.isBlank();
-        if (enabled) {
-            log.info("RemoteAiMindMapClient 已启用: endpoint={}, model={}", endpoint, model);
-        } else {
-            log.info("RemoteAiMindMapClient 未配置，将使用内置生成器");
-        }
-    }
+    private final AiServiceClient aiServiceClient;
 
     @Override
     public boolean isAvailable() {
-        return enabled;
+        return aiServiceClient.isConfigured();
     }
 
     @Override
     public String generatorName() {
-        return "AI-" + model;
+        return "AI";
     }
 
     @Override
@@ -63,12 +43,40 @@ public class RemoteAiMindMapClient implements MindMapAiClient {
                                           List<StudyReportFragmentsEntity> fragments,
                                           List<TaskApplicationEntity> applications,
                                           String clientHint) {
-        if (!enabled) {
+        if (!isAvailable()) {
             return Optional.empty();
         }
-        // TODO: 调用远程 AI API，构造 prompt 发送 reports/fragments
-        // RestClient.create().post().uri(endpoint).body(prompt).retrieve()
-        log.warn("RemoteAiMindMapClient: 远程 AI 调用尚未实现，请配置 API Key 并实现请求逻辑");
-        return Optional.empty();
+
+        // 提取报告和残片的内容文本
+        List<String> reportTexts = reports.stream()
+                .map(StudyReportsEntity::getContent)
+                .filter(c -> c != null && !c.isBlank())
+                .collect(Collectors.toList());
+        List<String> fragmentTexts = fragments.stream()
+                .map(StudyReportFragmentsEntity::getContent)
+                .filter(c -> c != null && !c.isBlank())
+                .collect(Collectors.toList());
+
+        if (reportTexts.isEmpty() && fragmentTexts.isEmpty()) {
+            return Optional.empty();
+        }
+
+        Optional<String> optOutline = aiServiceClient.generateMindMap(
+                task.getTaskName(),
+                task.getTaskDescription(),
+                reportTexts,
+                fragmentTexts
+        );
+
+        if (optOutline.isEmpty() || optOutline.get().isBlank()) {
+            log.warn("RemoteAiMindMapClient: lpt-ai 返回空大纲，降级");
+            return Optional.empty();
+        }
+
+        String outline = optOutline.get();
+        MindMapNode root = MindMapTreeTool.parseOutline(outline);
+        log.info("RemoteAiMindMapClient: 为任务[{}]生成 AI 导图，共 {} 个节点，{} 层",
+                task.getTaskNum(), MindMapTreeTool.countNodes(root), MindMapTreeTool.maxDepth(root));
+        return Optional.of(root);
     }
 }
diff --git a/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java b/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java
index 02ec4a8..434fe02 100644
--- a/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java
+++ b/src/main/java/com/guo/learningprogresstracker/service/impl/StandardMindMapServiceImpl.java
@@ -251,10 +251,10 @@ public class StandardMindMapServiceImpl implements StandardMindMapService {
             throw new OperationFailedException("任务[" + taskNum + "]没有学习报告或残片，无法生成思维导图");
         }
 
-        // 找可用的 AI 客户端
+        // 优先选 AI 客户端（非 BUILTIN），其次内置生成器
         MindMapAiClient client = aiClients.stream()
                 .filter(MindMapAiClient::isAvailable)
-                .findFirst()
+                .min(Comparator.comparing(c -> "BUILTIN".equals(c.generatorName()) ? 1 : 0))
                 .orElse(null);
 
         if (client == null) {
@@ -262,6 +262,16 @@ public class StandardMindMapServiceImpl implements StandardMindMapService {
         }
 
         Optional<MindMapNode> optRoot = client.generate(task, reports, fragments, applications, null);
+        // AI 生成失败时尝试降级到内置生成器
+        if (optRoot.isEmpty() && !"BUILTIN".equals(client.generatorName())) {
+            log.info("AI 思维导图生成失败，降级到内置生成器");
+            MindMapAiClient fallback = aiClients.stream()
+                    .filter(c -> "BUILTIN".equals(c.generatorName()) && c.isAvailable())
+                    .findFirst().orElse(null);
+            if (fallback != null) {
+                optRoot = fallback.generate(task, reports, fragments, applications, null);
+            }
+        }
         if (optRoot.isEmpty()) {
             throw new OperationFailedException("思维导图生成失败");
         }
diff --git a/src/main/resources/application.yml b/src/main/resources/application.yml
index 7226704..cca62bf 100644
--- a/src/main/resources/application.yml
+++ b/src/main/resources/application.yml
@@ -52,14 +52,8 @@ management:
             exposure:
                 include: health,info # 或 "*"
 
-# 思维导图 AI 配置（可选，未配置时使用内置生成器）
+# lpt-ai 独立 AI 服务（可选，未配置时降级为内置规则引擎）
 lpt:
-    ai:
-        endpoint:
-        api-key:
-        model: claude-fable-5
-        timeout-seconds: 60
-    # lpt-ai 独立服务地址（可选，未配置时报告草稿降级为残片拼接）
     ai-service:
-        url:
+        url: http://localhost:5199
         timeout-seconds: 90
\ No newline at end of file