Through practice and discussion of the application of digital leveling instrument to the settlement observation of high-rise buildings ,the paper puts forward some doubts about the current practice in medium and small-sized city that does not conform to the regulation and stipulation to the management departments and the survey and map departments for reference .

Based on this knowledge, taking an elementary school in shanghai as a research sample, this paper analyses the current operation of class norms of different school grades , meanwhile this study does some research on existed problems of class norms and their causes as well as provide some strategies to tackle these problems.