These parts, aspects and factors form a relatively stable connection, and this relatively stable connection is called structure. The interconnected parts, aspects and factors are always interdependent and interactive. The interaction and influence between the internal parts, aspects and factors of this kind of thing or phenomenon and the influence of the thing or phenomenon on other external things or phenomena The influence and function of the system are called functions. The method of analyzing the structure and function of things or phenomena is called structure-function analysis method. In the theoretical analysis of data, the structure-function analysis method can be carried out according to the following steps: one is to clarify the structure and function of the carrier, that is, the analysis object; the second is the internal structure analysis; the third is the internal function analysis; the fourth is the external Functional Analysis.