Abstract:Combining theory with practice is the basic principle of marxism philosophy. The traditional understanding of their relationship and explanation excessively concentrates on the determine to theory in the field of epistemology, and the understanding of relationships has simple tendency. This kind of situation is not beneficial to form innovative theory for the shake of directing the new social practice. We should divide the relationship in triple aspects: lag, synchronization and preact. Only in doing this can we unify the theory and the practice . We also can obtain the advancing theory to guide the practice of socialism with Chinese characteristics. And advanced theory possesses the innovative feature which is indispensable to the social development theories.