Abstract: In order to ensure the safe production of western Fushun Open-pit Mine and avoid the loss of personnel and equipment caused by geological disasters such as coal caving and landslides, slope radar monitoring and early warning technology is used for practical application research. The technical principles, technical advantages and early warning principles of slope radar are introduced, and the law of slope rock mass changes during the evolution of landslides is analyzed with cases. The results show that the technology is feasible and effective in predicting landslides in surface mines.