Cooling compact mid-infrared solid state laser is difficult for its compact structure and temperature restriction of laser pump module. A laser cooling system is proposed using forced convection cooling technique, thermo electric cooling technique and heat pipe technique. A finite element model for the laser cooling system is built with the COMSOL software. Temperature data is experimentally measured by sensors. The validity of this model is verified with the experimentally measured data. The effect of cooling system parameters, such as fan speed and heat pipe, on temperature distribution is numerically computed with the finite element model at different environmental temperatures. The results indicate that increasing the fan speed and installing the heat pipe are beneficial to improving the cooling effect, and the cooling effect is more obvious with the increase of environment temperature.