Abstract: The request of precision for surface subsidence prediction is very high in the proceeding of mining under a city.The prediction before mining is made usually by analogy method so that its precision is lower.Real-time prediction is adopted in this paper to ensure the safety of surface architectures and control the surface subsidence truly.In this real-time prediction method,measurement and prediction are carried on contemporarily and prediction parameters are calculated with new obtained data of surface subsidence to predict the possible surface movement and distortion in mining subsequently.The observation data is used momentarily and the prediction result is corrected continually;thus,the prediction result with very high precision may be obtained.