The distribution of optic gain,the stress in Nd∶YAG rod and the speciality of cooler are analyzed in this paper, the relation among the uniformity of optic gain, the distance between diode laser (DL) and center of Nd∶YAG,and the central wavelength of DL is identified. The model of pumping moudle is designed. 1～16 kW DL pumping moudles are packaged and tested. The result of measurement shows that it can work at a duty cycle of 20%. The uniformity of optic gain is 85% with input current of 120 A and 25 ℃ of cooling water temperature the small signal gain is 0.148 cm-1.