On how to correctly grasp the length of the thesis: when writing the graduation thesis, college graduates should produce results within a certain period of time. Therefore, due to the limitation of time, materials and skills, it is difficult to finish the paper on time. The topic is too small to reflect your true level. The size of the topic varies from person to person, from time to time and from condition to condition. For example, as correspondence undergraduate and junior college students, while busy with official duties and housework, they are limited to writing papers. It is difficult for such students to have a lot of time to collect information, especially in a certain period of time, it is difficult to conduct in-depth and systematic research on a certain problem, so they can only choose a smaller topic and explain their experience on a certain theoretical problem in combination with their own work practice. Or prove the correctness of a theoretical problem through work practice. For example, the research on the object of crime is relatively large, which is not suitable for undergraduate and junior college students. Then we can only choose the subtitle from this big topic. For example, the study of criminal objects can also select smaller topics from criminal objects, such as the study of intellectual criminal objects and the study of civil servants' criminal objects. In this way, the scope of discussion is greatly reduced, and it is easy to discuss deeply and clearly. In our opinion, under the conditions of limited education, qualifications, time and materials, the topics of graduation thesis for undergraduate and junior college students should be small rather than large.