The main purpose of material selection is to fully express the theme and make it more profound and prominent. Therefore, the choice of theme material is the first principle that must be followed. The theme is commander in chief. This shows that the core position of this theme and the role of commanding students must be independent of the theme, and the materials that can't explain, express and compare the theme will be abandoned.

Second, choose authentic and reliable materials.

The materials used in the paper must be true and reliable, and the arguments must be tenable and convincing. The so-called authenticity means that matter must conform to objective reality and reflect the essence of objective things. Some students don't choose materials, don't distinguish authenticity, and cite historical figures, events, time, place, figures, quotations, etc. Did not check carefully, which led to errors. In this way, the article is not convincing. To ensure that you can choose authentic and reliable information, first, you should observe carefully and investigate with real people. In order to avoid falsehood; The second is to carefully examine the selected materials, especially the details. Sometimes the reader doubts the whole truth of the article, which affects the whole paper.

Third, choose typical materials.

The choice of typical materials is another material selection principle that must be followed in thesis writing. Wei Wei said, "It is clear for people to illustrate the essence of materials with the most representative typical examples." It will also stand out. "Materials that can profoundly reveal the essence of things are typical materials with broad representation, universal educational significance and powerful functions. When a typical material appears in a paper, it can often touch a point at the same time. "

Fourth, choose innovative materials.

Choosing innovative materials means choosing materials with the spirit and characteristics of the times, which have never been used by others. Such as new facts, new policies, new statistics, new problems and so on. Choosing novel writing materials can improve the authenticity of the paper and make people feel refreshed. Innovative materials need students to discover. There are many repetitive, meaningless and typed things in real life. Students should be good at panning for gold from the sand and form their own unique creative experience with a unique perspective and keen sense of touch. Only in this way can they first discover and choose novel materials and give them a clear sense of the times and foresight.