Proceeding of the Joint International Symposium on Deformatuon Monitoring. 2-4 November, 2011. Hong Kong. China. Report. A real-time, accurate measurement of slope of open pit could provide reliable information for slope management and the warning system, directly related to the economic benefits and production continuity in the open pit. This paper proposed an innovative technique, based on synthetic aperture radar interferometry and implemented using ground-based instrumentation, has been applied for monitoring slope of open pit. Compared to conventional measurements, The proposed technique presents high spatial resolution and accuracy, generates a topography-free interferogram, provides multi-temporal displacement and velocity map, supplies a deformation field of slope, which represents reliable information for the interpretation of slope kinematics and short-term evolution. An example of application of this technique to the slope of open pit, Shan Xi, China, is described. The GB-InSAR derived ground displacements have been compared with those obtained by a set of topographic benchmarks placed in the unstable areas. Results shows that the new technique is a cost-effective solution for monitoring slope of open pit. The proposed method is shown to be a valid complement to space- and air-borne SAR and to the traditional geodetic instruments.