Because of large emission cross section, low lasing threshold, high slope efficiency, high absorption over a wide pumping wavelength, good chemical and mechanical properties, Nd:YVO4 is a kind of laser crystal material. Initially ,it is used for the small power DPSS, Along with the development of LD and laser systems, the power of DPSS is able to be up to tens of watts. Output power is good stability, Laser beam there is high polarization and good model.