High slope deformation monitoring method and system

The invention provides a high slope deformation monitoring method and system. The method comprises the steps of eliminating a carrier observation value gross error, eliminating a residual error by using an unbiased estimation method, calculating single-difference geometrical distance, performing carrier single-difference calculation on each monitoring station relative to a base station, establishing a carrier single-difference expression of all synchronous observation satellites, obtaining a difference between carrier single-difference matrixes of two adjacent epochs, establishing a matrix equation of a base line vector variation and a single-difference receiver clock difference variation between the epochs, and calculating a high slope three-dimensional deformation quantity by using a least square method. The monitoring method greatly improves the monitoring efficiency and the monitoring precision; a GPS receiver is arranged at each of the base station and the monitoring stations, and monitoring data of each