The volume Bragg grating (VBG) recorded in photo-thermo-refractive (PTR) glass is used as longitudinal mode selection element,and use the narrow filter which consists of transmitting and reflecting gratings to select longitudinal mode. We have obtained 1053 nm single frequency mode with 100% single longitudinal mode rate,2 mJ pulse energy in Nd:YLF laser. The experimental results show that the volume Bragg gratings work as both mode selector and output coupler,therefore simplify the structure of the cavity structure and improve the anti-interference ability. The laser also has the potential of high-power output.