The complex terrain, frequent movement of the earth's crust, dense vegetation exists in the western sichuan plateau where has frequent disasters. PSInSAR can extract the target with stable, strong scattering characteristics to monitor deformation effectively. The experimental area is in maoxian, erlang- mountain, chengdu. Paper uses, Pseudo-3D Phase Unwrapping and LAMBDA Method respectively related to GPS integer ambiguity resolution to unwrap phase and extract the surface deformation of the research area, and comprehensively analyze the effects of different surface and different solutions to the results. Experimental results show that the Network Adjustment Method in elevation correction and linear deformation rate has a comparative advantage, can be more applicable to maoxian, mountain complex mountainous area surrounding the transmission channel of deformation monitoring.