In this paper, a study of 1.319 μm CW Nd:YAG angel-locking laser is reported. The pulse width of less than 170 ps with repetition rates around 100 MHz and average power of 0.54 W are obtained. This kind of short pulse solid-State lasers with 1.3～1. 5 μm infrared wavelength has effective application in optic fibre commuication and transmission.