Ground subsidence information is obtained by using small baseline differential SAR interferograms in Shanghai.Amplitude and phase information of some high coherent targets remain stable in a long time sequence, so accurate deformation velocities of these points can be obtained with small baseline method. The area within the outer loop road in Shanghai is chosen for time series analysis of small baseline interferogram.17 ALOS PALSAR data between 2007 and 2010 are used to extract the LOS average rates of coherent targets. The result shows that there is a clear funnel shaped settlement in the junction of Hongkou and Yangpu districts, and a wide range irregular settlement in Minhang and Pudong districts.