In order to provide technological reference for selecting materials and setting slanting angle of slippery trapping plates in plague locust capturing machine, attachment force testing system (the resolution is 1mN, the measurement range is 0~3N) was designed, and attachment force of locust on the plates with different materials and slanting angles were measured with this system. The experiment results exhibited that with the different materials of the plates, like zinc plate, PVC plate and silicate glass plate, the attachment force of locusts decreased apparently as the slanting angle increased. For the fixed slanting angle, the attachment force of locusts on zinc plate showed the much lower values. Based on the experiment results, zinc plate was more suitable for the plate and the minimum slanting angle should be 35°~40°.