Abstract: Between 2002 and 2003, yield and digestible energy of 13 Maize varieties and 4 oat varieties used as Forage Grass were compared in Different Soil in JI Northwest Dryland. The result showed that Yield of FANGJIAOJIFENG58 was highest, the second was JIFENG503. their highest yield were 60000 kg/hm2 and 56000 kg/hm2. Dry yield were 10500 kg/hm2 and 9250 kg/hm2. Wet yield of oat 9244 and dry yield were 32852 kg/hm2and 8377 kg/hm2 in bottomland, that were highest among 4 varieties. Digestible energy of FANGJIAOJIFENG58 was highest among all those varieties. In a certain year, in the same planting condition, bottomland can save more water, and used up less, which is another reason for highest yield in bottomland.