To solve the problem that there is no rule to unify time for wider space such as solar system, a new rule for time uniformity is proposed in this paper. Space time-keeping system (STKS) evolves from the concept of Space Metrology which is based on the theory of General Relativity, and meets the convention of time unit and the beginning of time. It uses the cesium atomic clock to measure proper time and pulsars to measure coordinate time, unifying time through the coordinate time on the origin of solar system barycentre coordinate. The viewpoint of relative time denies the uniqueness of standard time. For different local area or coordinates, when looking from each other, one’ s measurement of the other’ s time interval would be uneven, showing a curved coordinate axis. While on the viewpoint of absolute time, the standard time is unique and different timing devices could be synchronized by dissemination technology. The concept of STKS will revolutionize the traditional viewpoint of absolute time. With a customized feedback mechanism designed, it would improve time keeping technology to a more stable scale.