Abstract: Runoff pollution caused by inappropriate land use has become an important factor constraining the improvement of water quality in urban rivers.The implementation of urban runoff pollution risk assessment and appropriate zoning control can provide new perspectives and ideas for water environment management.Based on the theory of the regional disaster system,the internal mechanism and the key factors affecting urban runoff water quality were explored,from the perspective of the whole process of runoff pollution disaster formation.Taking Hangzhou city as an example,a multi-dimensional urban runoff pollution risk assessment index system was constructed,including “the risk of disaster-causing factors,the sensitivity of disaster-prone environments,and the vulnerability of disaster-bearing bodies”.According to the evaluation results,the spatial distribution characteristics of runoff pollution risk were analyzed.The risk control areas of runoff pollution were divided,and the corresponding territorial space control strategies were proposed.The results showed that the risk of runoff pollution in Hangzhou city demonstrated a significant "center-periphery" decreasing trend.The risk types of "high-risk + high-sensitivity + high-brittleness" and "high-risk + high-sensitivity + low-brittleness" were mainly distributed in the residential and commercial areas at the city center,with a higher risk level of runoff pollution.The risk types of "low-risk + low-sensitivity + high-brittleness" and "low-risk + low-sensitivity + low-brittleness" were  mainly distributed in rural ecological space areas,with a lower risk level of runoff pollution.According to different types and levels of runoff pollution risk,and different characteristics of land use,the City was divided into four different types of territorial space control areas: stock renewal development area,limited development control area,key development planning area,and key ecological protection area.Corresponding control strategies were also proposed.