Abstract: Marxist parties' purity construction must be focus on the important tasks in different historical periods,so this is bound to be deeply branded with the imprint of the class and the times in the process of strengthening its own purity construction.At the same time, Marxist party, as a proletarian party guided by scientific theories is also a political party which can combine theory with practice naturally. Therefore, in the process of strengthening Marxist parties' purity construction, Marxist parties' purity construction can be known scientifically only by adhering to the unity of the class nature and mass, the unity of history and times, the unity of theory and practice, the unity of the long-term and the stage,the unity of integrity and individuality.