diff --git a/Entities/DTO/ExamDto.cs b/Entities/DTO/ExamDto.cs
index 4e13389..c5b82d3 100644
--- a/Entities/DTO/ExamDto.cs
+++ b/Entities/DTO/ExamDto.cs
@@ -28,6 +28,8 @@ namespace Entities.DTO
 		public string? Descript { get; set; } 
 		public List<SubQuestionDto> SubQuestions { get; set; } = new List<SubQuestionDto>();
 		public List<QuestionGroupDto> SubQuestionGroups { get; set; } = new List<QuestionGroupDto>();
+
+		// 标记是否是一个具有上下文的单独问题
 		public bool ValidQuestionGroup { get; set; } = false;
 	}
 
@@ -46,12 +48,34 @@ namespace Entities.DTO
 
 		public string? QuestionType { get; set; } 
 		public string? DifficultyLevel { get; set; }
+
+		// 标记是否是一个独立的问题
 		public bool ValidQuestion { get; set; } = false;
 
 	}
 
 	public class OptionDto
 	{
-		public string Value { get; set; }
+		public string? Value { get; set; } = string.Empty;
 	}
+
+
+	public static class ExamDtoExtension
+	{
+		public static void Convert(this ExamDto examDto)
+		{
+			var qg = examDto.QuestionGroups;
+
+		}
+
+		public static void Convert(this QuestionGroupDto examDto)
+		{
+			if(examDto.ValidQuestionGroup)
+			{
+
+			}
+
+		}
+	}
+
 }
diff --git a/TechHelper.Server/Context/AutoMapperProFile.cs b/TechHelper.Server/Context/AutoMapperProFile.cs
index e250cc9..226d534 100644
--- a/TechHelper.Server/Context/AutoMapperProFile.cs
+++ b/TechHelper.Server/Context/AutoMapperProFile.cs
@@ -82,6 +82,12 @@ namespace TechHelper.Context
 			CreateMap<SubQuestionDto, AssignmentQuestion>()
 				.ForMember(dest => dest.Question, opt => opt.MapFrom(src => src)); // 映射到嵌套的 Question 对象
 
+			CreateMap<QuestionGroupDto, QuestionGroup>()
+				.ForMember(dest => dest.ChildQuestionGroups, opt => opt.MapFrom(src => src.SubQuestionGroups))
+				.ForMember(dest => dest.Title, opt => opt.MapFrom(src => src.Title))
+				.ForMember(dest => dest.Description, opt => opt.MapFrom(src => src.Descript));
+
+
 
 			CreateMap<Assignment, ExamDto>();
 		}