Abstract: In order to grasp the deformation law of open pit slope, a set of automatic monitoring system based on modern monitoring technology and combining network communication technology and computer technology for reflecting in real time and dynamicaly the displacement and deformation and stress change of the slope has been established. Through the continuous monitoring of the north slope of Haizhou open pit, the results show that Haizhou open pit is of creep deformation and landslide, and currently in a state of local deformation and overall stability. The construction of the system can realize the high precision, automation and continuous monitoring of the slope displacement and stress. It will provide effective technical support for dynamic early warning of slope disaster and making safety decision timely. And it is of great significance for prevention and control of landslide disaster.