Intensive discussion and analysis are focused on the phenomenon of pointing stability based on the E-O Q-switched solid-state Nd∶YAG laser system.The temperature distribution of laser material in different temperature distribution is simulated by CFDesign.The optical axes drift of the laser produced under different heat dissipation and pump structure is measured and the cause of optical axes drift is pointed out.The experimental and simulation results have certain reference significance for laser design with optical axes drift requirements.