Political freedom and its limits is a problem that should be treated strictly.This paper focuses on Lenin’s idea of this problem and tries to reveal the meaning of political freedom and explore the contents of this concept it coves,including freedom of election,speech,press,assembly,incorporation,religion,and so on.Furthermore,it discusses in detail Lenin’s idea of the limits of political freedom.As to Lenin,Political freedom must banish domination of capital or eliminate the phenomena that the minority is rich,but the majority is still poor in society.So the proletarian party should transcend the limits of formal equality between the rich and the poor,and guarantee the exploited laborers enjoying freedom and democracy.