Abstract: In order to select more suitable lettuce varieties for high temperature season in the northern mountainous area of Beijing, a cultivated product ratio experiment is carried out on 5 new varieties and one main cultivar. The experiment is carried out to determine the yield, shape and resistance of 5 varieties of lettuce on the sixtieth day after planting, and the data are overall evaluated by membership function method. Among the 5 varieties, the yield of the “shooter 101” is the best, the plant type of “Beisheng No. 1” is the most compact, so it is suitable for intensive planting, the leaf of “iron man" is the biggest with the best commodity form. What’s more, the resistance ability of bolting of “Beisheng No.1” is the best, and its resistance to high temperature is also the best; the resistance ability of heartburn of “Beisheng No.1” is also the best, so its commodity appearance is the best. The comprehensive performance of the 4 new varieties of lettuce is better than that of the control cultivar “shooter 101”, and these 4 new varieties are suitable for the promotion of the high temperature cultivation season in the northern mountainous area of Beijing. Among them, the comprehensive performance of "Iron Man" is the best.