Abstract: In order to study pulsed electro-optic Q-switched Nd:YAG laser at 1319nm, the transition radiation energy level of Nd:YAG crystal was analyzed.A single pulsed laser at 1319nm was acquired after restraining laser oscillator of wavelength at 1064nm through coating chosen film on the mirror. In a configuration of lamp pumped, water-cooled Nd:YAG with KD*P as eleciro-optic Q-switched, pulsed output static energy of 340.9mJ at 1319nm, Q-switched output energy of 768mJ with pulsed-width of 17ns and divergence of 2.7mrad were acquired.Experimental results show that coating chosen-film can be used to obtain laser at 1319nm.