文献分析法。本文收集了大量的第一手资料，对这些资料进行了分析和归纳整理

Document analysis. This article collects a lot of first-hand information, analyzes and summarizes these materials, and absorbs and learns valuable content. <br>2. Logic analysis. This article adopts the logical analysis route of "proposing a problem-analyzing a problem-solving a problem". <br>3. Connect theory with practice. This paper has carried out practical discussions in conjunction with the relevant work reality while theoretical analysis

The method of literature analysis. This paper collects a large number of first-hand information, analyzes and summarizes these materials, absorbs and learns from valuable content.<br>2. Logical analysis. This paper adopts the logical analysis line of "asking questions - analyzing problems - solving problems".<br>3. Theory is linked to practice. This paper, while analyzing theory, also combines the relevant work practice, and makes a practical discussion.

Literature analysis. This paper collects a large number of first-hand data, analyzes and summarizes these data, and absorbs and references valuable content.<br>2. Logical analysis. This paper adopts the logic analysis route of "putting forward problems - analyzing problems - solving problems".<br>3. Combine theory with practice. At the same time of theoretical analysis, combined with the relevant work practice, this paper makes a practical discussion<br>