In order to optimize the application technology of inert dust with transverse ventilation system, we compare the mortality rates of insects pre-buried ingrain stack in different parts of the warehouse with 18m span, and judge the uniformity of distribution of inert dust and the effect of pests control after applying the inert dust by transverse circulation technology. The results show that the transverse circulation can make the inert dust aerosol run through thegrain stack, and the distribution of the particles in thegrain is relatively uniform; the corrected mortality rates of Sitophilus zeamais, Rhizopertha dominica, Tribolium castaneum（Herbst）and Cryptolestes pusillus (Oliver) are 27%,37.8%,4.6% and 54.2% respectively 15 days later.