The category of history mainly refers to the development and change of a concept, which has different meanings or forms of existence in different historical periods. For example, the concept of people will have different meanings and components in different historical periods. In feudal society, the main body of the people is farmers; Capitalist society is a workers' society. In China, people are defined as builders of socialism and patriots who support the reunification of the motherland. This category requires us to analyze problems and evaluate historical figures from a historical perspective. []