The experiment on forest culture density of Robinia pseudoacacia,Hippophae Rhamnoides, Lespedeza bicolor, Caragana microphylla and Caragana korshinskii in the semiarid area showed that the high yield may beobtained for R. pseudoacacia with density 1×1m,if the rainfall is normal,the period of high yield with such density will last. The suitable donsityof crop for H.rhamnoides is 1×1m and 1×1.5m .The density 0.3×1m is rightfor L. bicolor before 4 years,after 5 years it depends on rainfall.C. microphylla branches out more,so the density 0.5×1.5m is suitable,while C. korshinskii ramifies less,the yield with density (seeding in lines×1.5m) ishigher than 0.5×1.5m,and its plants grow better.