Laser welding is an indispensable advanced manufacture technology in the modern production, and it has excellent welding performance compared with the conventional welding ways. However, it can reduce the performance of the welding-joints if the inappropriate welding parameters are adopted. Therefore, it is important to select the right welding technical parameters to get excellent welding properties. The effects of welding parameters on the welding properties are studied. The laser welding of austenitic stainless steels is studied experimentally and a smooth, good-looking welding-joint is obtained by controlling welding power, welding velocity, flux of protective gas and facula diameter. However, its tensile strength is just 63.5% of that of the basal body, which is greatly lower than the reported data (99.4%). The main factors to affect the welding properties by the micro-morphological analysis of the welding-joints include lower laser output power, slower welding velocity, and a rather large heat-affected-zone (HAZ).