How to analyze the displacement data gained from monitoring is very important for rock-soil engineering design and constructuion. Displacement-time analysis has been becoming the main favourable method for a long time. But in order to make the data more useful for modifying design and. guiding construction, we put out the method of comparing and analysing displacement at space in this paper. Furthermore, we suppose to creat the method of synthetically displace at time and space, when connecting it with the usual method of displacement-time analysis. The former has been proved applicable since it has been used at the deep excavation pit of Chaiyun Buiding in Jinan, etc.