Wenchuan earthquake caused a variety of secondary mountainous hazards.Risk assessment regarding secondary hazards is therefore very important for reconstruction projects in the affected areas.Based on regional data analysis,assessments of dangerousness,vulnerability,and risk were carried out.A linear relationship was found between dangerousness degree and disaster density.Assessment results show that highly dangerous regions concentrated along Longmengshan fault,accounting for 39.8%of the total area.Regions of high and extremely high vulnerability mainly surrounded the cities of Chengdu,Mianyan,Deyang,and Ya'an,accounting for 13.1%of the total area.Regions of high risk,accounting for 11%of the total area,occupied the transitional zone between Longmeng Mountain and the piedmont plain,which had high dangerousness degree and high vulnerability,respectively.Special attention should be paid to the regions of high risk and vulnerability during the reconstruction.However, the regions of moderate should also be cared as the risk and vulnerability of these areas could be potentially deteriorated due to the rapid expansion of the reconstruction areas.