Results using petri dish bioassay showed that ether extractions from metathoracic gland secretions of adult Tessaratoma papillosa (Drury) were repellent to adult T. papillosa themselves. By using gas chromatography\|mass, five compounds from the ether extractions, (E)-2\|octenal, undecane, dodecane, tridecane and an unknown component, were found. Four components, (E)-2\|octenal, undecane, dodecane and tridecane, elicited EAG responses of the adult T. papillosa males and females, and (E)-2\|octenal was the strongest, whose elicited EAG responses for adult females and males were 0.50 mV and 0.4 mV, respectively. The Y\|tube olfactometer bioassay indicated that adults were only significantly (P <0.01) repelled by (E)-2\|octenal among the four tested chemicals. The results suggest that the metathoracic gland secretions of adult T. papillosa could be as an effective control agent for T. papillosa.