Abstract: This paper uses PS-InSAR technology to obtain information on the field of subsidence rate and accumulated subsidence in the Shanghai area, and analyzes the temporal and spatial distribution characteristics of subsidence in this area, as well as the correlation between subsidence and precipitation in this area, subway construction and operation and other influencing factors. The research shows that:①The subsidence in Shanghai is unevenly distributed. The subsidence in the north of Shanghai is relatively stable, while the Hongkou district in the middle, the Minhang district in the south, and the Pudong new area in the east all have different degrees of subsidence. Among them, the Minhang district has the most serious subsidence, and the maximum cumulative subsidence is -43 mm, with large-scale, large-scale subsidence. ②The subsidence in the study area is nonlinear. The apparent seasonal change of subsidence is related to regional precipitation. The timely supplement of rainfall to groundwater can effectively alleviate excessive groundwater. ③Some sections of Line 3, 15 and 16 of Shanghai subway all have obvious settlement, and the settlement of Line 15 in the construction stage is the most obvious, and the maximum accumulated settlement of some sections is -34 mm.

Key words: subsidence monitoring, PS-InSAR, Sentinel-1A, Shanghai