The topic selection of graduation thesis needs to consider interest, professional direction and research hotspot to ensure that the research has practical significance and academic value. A good topic should have clear research objects and problems, which can arouse readers' interest. For example, we can choose topics related to current research hotspots such as "Research on image recognition technology based on machine learning" or "Analysis and research on user behavior in the era of mobile Internet" to provide strong guidance for the follow-up research.