1) Don't cover too many topics. After determining the basic direction, first search the database for relevant keywords (about 40-50 articles, and ensure that more than half of them are in foreign languages. After reading them, you can basically determine your own breakthrough direction.

2) The topic should not be too old. The first thing is to look at the depth of your graduation thesis in the similar direction, and consider in what direction you can show the difference with other people's research results when formulating the thesis framework. This is innovation. The topic is too old to be original.

3) Consider the feasibility of the mentioned contents and research methods. In fact, relatively speaking, the resources and cost of the master's program are slightly limited, so when considering new innovative ideas, we must examine the feasibility of experimental conditions, otherwise the experimental scheme will be greatly changed in the later stage, leading to overall changes, more rework and a waste of time.