To explore the applicability of calling behaviour in brown planthopper Nilaparvata lugens, and white backed planthopper, Sogatella furcifera, as measures for their occurrence forecast or physical control,some inducement experiments were conducted in laboratory in CNRRI. The results showed that: 1)The acoustic association transmitted through substrate (host Plant) between matured individuals of both sexes in same species is the courting signal used for recognizing and connecting with opposite sex, stimulating sex excitement,and fulfilling mating process. The tested insects could responed to the signals in a distance of about 60-80 cm and was more sensitive within 45 cm. 2)Both sexually matured males and virgen females emitted acoustic signals initiatively. The males responed to the signals of female actively and moved towards the females for mating. On the other hand,the female responed to male signals but without moving. 3)The courting signal was species specifical.Both sexes of two species only responeded to heterosexual signal of the same species respectively. 4)There was no significant difference between the reactions to real courting signal and to playback of calling record.