Thermal conductivity coefficient is an important index to evaluate thermal insulation properties of materials

but determination of thermal conductivity coefficient of composite materials is often constrained by various environmental conditions. Thermal conductivity coefficients of composite materials are obtained by using the theoretical computation formula of thermal conductivity coefficient of composite materials and the simulation method of COMSOL software. And the results of theoretical calculation and simulation results are compared with the measured thermal conductivity coefficient of composite materials. It shows that the thermal conductivity coefficient calculated theoretically is lower than the measured data

the maximum relative error is more than 29 %;COMSOL simulation results is coincide with the measured data

the relative error is less than 5 %.