Abstract: Traffic accidents on highway from 2005 to 2008 were analyzed based on relative data in Liaoning province. The results show that the number of annual traffic accidents on highway is the increasing trend. Traffic accidents caused by weather and disadvantageous road conditions related to weather account for 20.4%, which often occurs during May to August and November to January. The accidents caused by fog are most and account for 41.0% among various weather phenomena, followed by rain about 31.3%. Finally, four countermeasures were put up in order to improve meteorological service on highway, i.e. dividing key road segment and key period for disastrous weather service, establishing meteorological disaster prevention local standard on highway operating safety, setting reasonable weather stations layout along highway, enhancing the mechanism study on the effect of weather on highway.