Abstract: The relationship between reality and ideal of Marxist is not external but the internal unity. Both the reality and the ideal are important parts of Marxist doctrines. In other words, they are two important indivisible dimensions of Marxist doctrines. Neither could be abandoned, or it will deviate from the essence of Marxist doctrines. Under the new historical conditions, it is of great importance to rethink the relationship between Marxist reality and ideal, grasp the essence of Marxist doctrines, and strengthen communist ideal and firm faith.