There are three main methods of profitability analysis: (1) Profitability analysis is the main analysis method.The results are intuitive and easy to compare.It is convenientto use and evaluate the operation of the company. (2) The trend analysis of profitability is to compare the data of the company for different successive periods to obtain the change trend of the profitability of the company. This isa vertical comparison between the company's historical data, we can better see the changes in the company's profitability over time, summarize experiences and find problems.(3) The structural analysis of profitability is an analysis method that compares the amount of related expenses, profits and income items with the corresponding total amount or amount of a specific project to viewthe structure of these items, to become familiar with the profitability of the company.