This paper presents a statistical analysis of the MDRS launch and the important weather probabilities forecasts at Nanjing Airport from 2015 to 2018.The complex weather at Nanjing Airport is mainly characterized by heavy fog,thunderstorms,heavy precipitation and strong ice and snow as well that affect flight operations in January.In terms of assessment results among the weather forecasts that hit the target,the inaccuracy rate(with a forecast error of more than 4 hours)is less than 20%,indicating better forecasting results.In addition,the missing reporting rate of heavy fog weather forecast is the highest while the accuracy rate of ice and snow weather forecast is the highest.