Abstract: The morphology and distribution of sensilla on antenna, compound eye, mouthparts, legs and terminal abdomen of Quadrastichus erythrinae Kim adult were observed by means of environment scanning electron microscope. It was found that seven types of sensilla, trichodea sensilla, chaeticum sensilla, multiporous plate sensilla, swordlike sensiUa, auriform sensilla, mammilliformia sensilla and zonated sensilla were on the surface of antennae;two types of chaeticum sensilla and basiconca sensilla were on the surface of mouthparts; three types of trichodea sensilla, chaeticum sensilla and basiconca sensilla were on legs;four types of trichodea sensilla, chaeticum sensilla, basiconca sensilla and coeloconica sensilla were on the terminal abdomen. The difference of the sensilla types and distribution between sexes were described and discussed.