Abstract: The open pit of the Western Opencast Coal Mine in Fushun, Liaoning Province is the largest of its type in Asia. The opencast mining is adjacent to the urban area of Fushun and large enterprises. The long-term and high-intensity mining induced series of geologic disasters. With the practice in slope deformation monitoring for the Western Opencast Mine, the characteristics and construction of GPS real-time monitoring system is summed up. Based on the actual operation status of the system, the feasibility and reliability of the GPS real-time monitoring technology is assessed.