The operations of air conditioning disinsection and storage were carried out by membrane separation nitrogen equipment within two warehouses equipped respectively with transverse and vertical ventilation system under the same conditions to compare the disinsection effect,concentration raising rate,unit energy consumption,uniformity of gas distribution,etc.The results showed that insecticide effect in the warehouse arranged with transverse ventilation is slightly better than that with vertical system,the concentration raising rate was 1.7 times higher,and the unit energy consumption was 21% lower,while the uniformity of gas distribution was basically the same.