Abstract: Temporal-spatial distributions of bad-weather conditions including low temperature,snow cover,rainstorm,fog,wind,thunderstorm and hail,which can influence the High-speed Railway (HSR) operations,were investigated using methods of a spatial analysis and a time serial analysis.Observational data from 52 weather stations in Liaoning province from 1982 to 2012 were used to conduct this study.The results show that the most parts of Liaoning province belong to extremely cold region except for the Liaodong Peninsula and circum-Bohai sea areas where they belong to cold region.The maximum number of days with snow cover appears in January (13 days) from 1982 to 2002.The areas with snow depth more than 50 cm are distributed in the mid-north and eastern mountain of Liaoning province as well as Yingkou.Most rainstorms happen in May and June and the number of monthly-occurrence time is about 0.2 on average.The number of annual average rainstorm days with 2 days is relative high in western part and eastern mountain regions of Liaoning.Annual average frequency of thunderstorm ranges from 5 to 7 for recently 30 years and most thunderstorms happen from June to August.The areas with high frequency (more than 30 times per year) of thunderstorm are distributed in the mid-north of Liaoning and Chaoyang.Comparatively,the frequency of thunderstorm in other areas is 21-30 per year.According to the influence characteristics of severe weather on the periods and sections of HSR,crucial periods and sections of meteorological service for severe weather along the HSR in Liaoning province are provided.Finally,the further development trends and directions of meteorological service for the HSR are proposed.