After the topic of the master's thesis is completed and approved, it is generally not allowed to be modified. Only under special circumstances, such as the research topic has been proved to be meaningless recently and the research topic is repeated, can the topic be changed. The master's thesis fails and cannot be rewritten in another topic. Generally, it can only be rewritten according to the original topic. Therefore, before determining the topic of the paper, we should fully consider and choose a suitable topic, and keep consistent in the writing process.