diff --git a/src/main/java/com/project/classicpaper/domain/service/impl/FallbackClassicPaperQuestionGenerator.java b/src/main/java/com/project/classicpaper/domain/service/impl/FallbackClassicPaperQuestionGenerator.java
index e2a055a..406234b 100644
--- a/src/main/java/com/project/classicpaper/domain/service/impl/FallbackClassicPaperQuestionGenerator.java
+++ b/src/main/java/com/project/classicpaper/domain/service/impl/FallbackClassicPaperQuestionGenerator.java
@@ -16,6 +16,7 @@ import org.springframework.beans.BeanUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
 import org.springframework.stereotype.Component;
 
 import java.util.*;
@@ -32,6 +33,7 @@ import java.util.stream.Collectors;
  * 后续对接真实算法时，替换此实现即可，调用方无需改动
  */
 @Component
+@ConditionalOnProperty(value = "classicpaper.algorithm.enabled", havingValue = "false", matchIfMissing = true)
 @Slf4j
 public class FallbackClassicPaperQuestionGenerator implements ClassicPaperQuestionGenerator {
 
diff --git a/src/main/java/com/project/interaction/domain/dto/GenerateQuestionRequestDTO.java b/src/main/java/com/project/interaction/domain/dto/GenerateQuestionRequestDTO.java
index 852cfe2..99b7653 100644
--- a/src/main/java/com/project/interaction/domain/dto/GenerateQuestionRequestDTO.java
+++ b/src/main/java/com/project/interaction/domain/dto/GenerateQuestionRequestDTO.java
@@ -29,6 +29,12 @@ public class GenerateQuestionRequestDTO {
     @JsonProperty("num_questions")
     private Integer numQuestions;
 
+    /**
+     * 业务标识：PQ:paperQuestionId，回调时原样返回
+     */
+    @JsonProperty("biz_key")
+    private String bizKey;
+
     /**
      * 题目类型列表
      */
diff --git a/src/main/resources/application-dev.yml b/src/main/resources/application-dev.yml
index acfc320..3f16376 100644
--- a/src/main/resources/application-dev.yml
+++ b/src/main/resources/application-dev.yml
@@ -107,6 +107,10 @@ classicpaper:
     # 生成题目模拟延迟（毫秒，Mock 模拟算法处理耗时）
     generate-delay-ms: 2000
 
+  # 是否启用真实算法（false=使用 Mock）
+  algorithm:
+    enabled: false
+
   spare:
     # 每道题预生成的备用题数量
     per-question: 2