The optical properties of long-period fiber gratings are studied,and long-period gratings are successfully written in the hydrogen-loaded standard single-mode fibers by a KrF excimer laser and point-by-point method with a properly designed program-controlled auto-scanning exposure system.The experimental results show that this method is highly flexible in the fabrication of long-period fiber gratings.The stability of the long-period gratings written in hydrogen-loaded standard single-mode fibers are studied and discussed.