Abstract: This paper uses the ALOS satellite 6 scene PALSAR as experimental data.Using the mathematical model processed by two-track differential interferometric,after completing image registration,resample,removing terrain phase,filtering and phase unwrapping,the D-InSAR strip deformation time series of highway goaf are achieved.Comparing the test data with measured data and correcting InSAR data,the results show that it is feasible to use the D-InSAR to monitoring highway deformation above goaf,which has broad application prospects.