Observed the hair sensors (tactile hair, trichobothrium, gustatory hair) of Pardosa pseudoannulata by Scanning Electron Microscope. The result indicated that tactile hair forms the acute Angle with the surface of spider body, tactile hair is big and thick and hair is straight and with villus around. Tactile hair is maisanly distributed on the hocks tibiae and the end of the ambulatory leg of legs and pedipalp section of spider’s body, and the first step is where tactile hair assembles sufficiently.The quantity of tactile hair is more than the quantity of trichobothrium and gustatory hair. Trichobothrium is thin and long and basically perpendicular to the epidermis. Hair follicles of trichobothrium is deep pit and with folds. Trichobothrium are mainly distributed in the fourth step foot and the palp, the rest have a small amount. The base of gustatory hair has a slight bulge around the round shape of hair follicles, which is more than trichobothrium but is less than cirrus. Gustatory hairs are mainly distributed on the first step of ambulatory leg and second ambulatory leg.