通过摸清华北落叶松猝倒病在甘肃临夏地区的发病规律，确定出病原菌活动盛期、幼苗易染病期和日灼始点温度，提出了综合工程预防措施，即播种时间为３月下旬、高床整地、侧向灌水；出苗后１～４０ｄ，用稠竹帘遮荫（直射光最大透光率在４５％～５０％），而后更换为稀竹帘（直射光最大透光率为５５％～７０％）。采用工程预防措施投资小，效益高，幼苗成活率在９５％以上。 By finding out the law of onset of Larix principis-rupprechtii in Linxia region of Gansu Province and determining the peak period of activity of the pathogen, the susceptible period of seedling and the initiation temperature of seedling, a comprehensive engineering preventive measure was put forward, that is, sowing time was in late March, Soil preparation and lateral irrigation; 1 ~ 40 days after emergence, with bamboo thick shade (direct light maximum transmittance of 45% to 50%), and then replaced by thin bamboo curtain (direct light maximum transmittance of 55% 70%). The use of project prevention measures to invest in small, high efficiency, seedling survival rate of 95% or more.