A gate-type spray system was introduced for better control of insect pest in the corn crop grown mid latterly, due to the problem caused by coverage limitation of high-frame corn sprayer and low efficiency of hand operating knapsack sprayer. The new sprayer combined suspender spray device and horizontal spray boom, and was suitable to high-frame row span and self-propelled sprayer of the corn zone in northeast China. The structural and performance parameters of the system derived by theory and experiment methods were as follows: the spray angle of top nozzle and branch nozzle were 80° and 110° respectively, the angle between the “Y” branch boom and the vertical boom was 20°, the length of the boom was 1200 mm, the spray scale of the gate-type spray system in the vertical plane was 1150 mm. For analyzing the deposition characteristics of the gate-type spray system, a contrast test with the conventional boom sprayer was carried out on the test bed. Compared with the latter, the advantages of the gate type spray system were shown as follows: the unit area droplets deposited amount(UADDA) on the front surface of the leaves located on upper-middle positions was 12.5% higher than the latter, while the spray volume was the same. The UADDA on the back side of the leaves located middle position and the two sides of the leaves of the lower positions were significantly increased by using the suspender spray device. The combination of suspender and horizontal boom resulted in better deposition uniformity. 