Prosperity index, also known as prosperity degree, is an index that comprehensively reflects the state or development trend of a specific survey group or a social and economic phenomenon by processing and summarizing qualitative problems in prosperity survey through quantitative methods. The value of the prosperity index is between 0 and 200, and 100 is the critical value of the prosperity index. When the prosperity index is greater than 100, it means that the situation tends to rise or improve, and it is in a prosperous state. The closer it is to 200, the better. When the prosperity index is less than 100, it shows that the situation tends to decline or deteriorate and is in a depressed state. The closer to 0, the worse.