Abstract: The antennae sensilla of 7 Tetrigidae species are studied using scanning electron microscopy.There are only four types of sensilla,named sporangium sensilla I,sporangium sensilla II,cavity sensilla and placoid sensilla.The placoid sensilla has the most large quantity in all four types of sensilla.The most sensillae are mainly distributed in the central and terminal segment of antennae.This structure of distribution is exactly expressed in placoid sensilla which is distributed from tenth segment ..