Conservation equation of energy based on the physical property of solid-liquid mixed charge and the heat caused by the friction between shell and charge during launching, was established and calculated by finite difference method to analyze the launching safety of solid-liquid mixed charge. Results show that the maximum temperature of charge reach 542 K when the warhead rotation speed is 40 r·s^-1, and the warhead rotation is the main hazard source in the launch process of solid-liquid mixed charge.