Abstract: Children's egocentricism is a very important concept in Piaget' s Genetic Epistemology. Children egocentricism is embodied in two aspects: intellective egocentricism and social egocentricism; It is also embodied in two stages of children's psychology development: sensorimotor stage and pre-operation stage. According to Piaget's point, lack of coordination in actions and mix-up between: subject and object are the sources of psychological egocentricism. Children's intellective and social egocentricism will disappear along with the coordination in actions. On the basis of individual psychology, Piaget's analysis of the sources of children egocentricism, and the way of de-egocentricity he mentioned are correct in the main; but there are some defects as viewed from the psychosociological mechanism. These defects are obvious epistemological centralism, confusion of inter-subject relation and subject-object relation, and neglect of the inner link between semiotic function and removing social egocentricism.