Abstract: Public Choice Theory was born amidst fierce arguement and great difficulty. It uses the method of economics to analyse the problem of politics. The most contended parts of Public Choice Theory, such as electorate (voter) research, analyse for political personages and government officials.They presume that people are selfish when they do anything, and then they study political personages and government officials- mutual actions in the background of democracy system, and so on. This paper is presented and computed with the numbers of the origination and development of Public Choice Theory; the innovation of Public Choice Theory; the focus of argument of Public Choice Theory; and the New Evolution of Public Choice Theory.