TThis paper expounded the formation of personality in the theory of personality system development from the perspective of space thinking and time thinking.“Personality system development theory” believes that personality is three-dimensional and develops continuously in space-time thinking.In terms of spatial thinking，personality is a “core layer” composed of “courage” and “self”，on which the middle layer and the explicit layer are developed，and finally develop the seven elements of personality-courage，ego，interpersonal relationship，willpower，thinking (thinking mode)，talent outlook (world outlook) and temperament (sexual development)，tending to be stable.In terms of time sequence，the development of personality presents a spindle structure with seven elements as the core，from the beginning to the prosperous，and then to the end.