A laser diode(LD) side-pumped,two-stageamplification,electro-optical Q-switched all solid-state Nd∶YAG laserwas designed to achievethe adjustable intervalof the pulse sequences.The side-pumped source of the crystal rods is U-packaged LD modules.Using RbTiOPO4(RTP) crystal as the Q-switch,the pulse sequence laser output is obtained.The single pulse energy is more than 550 mJ and the pulse width is less than 8 ns.The spacing of the pulse sequence is adjustable from 180 μs to 240 μsby providing high-voltage sequenceto Q-switch.The results show that the spacing of the pulse sequence is stable,the energy is consistent,and the repetition frequency of the laser is 5Hz.