Abstract: Maximum range, as a combination property for evaluating ranging performance of a laser range finder, one of the important factors that affect the operational effectiveness of weapon systems, is paid more and more attention. In order to realize high beam quality and narrow pulse width seed source of the laser ranging system,the electro-optic Q-switch rubidium titanyle phosphate RbTiOPO4 (RTP) crystal used to be used in the low-repetition-rate Q-switch was used in high repetition rate laser. A laser at 1064nm was obtained at repetition rate of 25Hz,pulse width of 1.8ns,pulse energy of 1.5mJ,beam quality of M2<1.3. The results show that this laser provides a qualified seed source for narrow pulse width of 1ns~3ns,pulse energy of 200mJ and no water-cooled all-solid-state laser ranging system. These results are helpful to the laser design with high beam quality and narrow pulse width.