Predicted rainfall in the area of the Tian’anmen Square, the site for the firstround grand National Day celebration rehearsal, had prompted Chinese authorities to postpone the date for the second round from 5 September. 2009 to the next day. By utilizing the monitoring data of FY 2C, the new generation weather radar network, automatic weather stations, wind profile, and microwave radiometer etc., with the combination of the products of BJRUC model, the very shortrange forecast for the rainfall event in the area of the Tian’anmen Square was produced, and the tailored meteorological service was provided, then the good service effect had achieved. Through the forecasting service, it is proved that comprehensive monitoring data are very useful for the explanation and application to the status of atmospheric physics and making up the lack of temporal and spatial distribution of conventional data. The data are helpful for the determination of the position and variation of the synoptic system, even the extrapolation beyond 2 hours.