The geometry,stability,and electronic properties of the small clusters Au_nS( n = 2 ~ 8) were studied systematically based on density functional method PW91PW91 and an effective core potential basis set. Some corresponding stable ground state geometries and isomers were given. The stability and electronic property were analyzed by HOMO- LUMO gap and the second- order difference of energy. The results show that the ground state structures of Au_nS clusters are planar and 3D configuration. The caloric stabili...