Abstract: By assessing the hazardness resulted from precipitation based on national quantitative precipitation forecast (QPF), and estimating the fragility and exposure degree of the freeway, environmental sensitivity of surrounding areas, and capacity of disaster prevention and reduction of the local government, this study proposes a set of specifications on early warning of risks in precipitation induced transport disasters on freeway. The social statistical data including road conditions, economic level and geographic information are integrated into a normalized vulnerability metric, which help convert the rainfall intensity forecast into some impact pre-assessment, i.e. the five levels in early warning of risks. Compared with freeway blockage records, the results from this study are illustrated to be reliable and indicative for the precipitation induced freeway blockages.