The city air pollution prediction system in Guangxi was established by applying component prediction technology of the numerical prediction model and the model of dynamic statistics prediction. Also, the platform for the workers from the departments of meteorology and environment protection to hold consultations on city air pollution prediction was set up. The feature of the air pollution prediction system was that the model operation of air pollution prediction, the data transmission and exchange, the outcome of prediction were integrated with, and the Guangxi Meteorological Observatory could issue air pollution prediction at the same time for the cities of Nanning, Guilin and Beihai. The practice in prediction for two years indicated that the system performed stably, automatically and accurately.