Abstract: The selfknowledge of personality is the selfperception of individuals' thinking, emotion, behavior and reputation. Usually, it is obtained by introspection, the selfand otherobserving of behavior. The study indicated that there is some moderately correlation between selfknowledge of personality and behavior, people have some insight of his or her personality and the accuracy is changed with personality dimensions. Influenced by the information and motivation obstacle, the selfknowledge of personality has its own limits. Because of the blind spot and motivation factor in selfperception, people cannot judge himself or herself without any prejudice like stranger, there exist asymmetry between the self and other knowledge of personality. There are some effective ways to improve the accuracy of selfknowledge of personality, such as providing the true feedback information, reducing the selfprotection motivation, using mindfulness skills and insisting on beyourself.

Key words: Personality, SelfKnowledge, SelfPerception, Accuracy, Limit