Abstract: Based on the characteristics of the honeycomb sandwich composite material structures, the transient temperature field of the structures is assumed. Depending on this assumption and with the concern of the effect of temperature on the heat characteristic of the material, a method for honeycomb sandwich composite material structure heat transfer is obtained. It is an improved approach based on the 3-D anisotropy heat transfer theory and the composite material thermal laminated theory. The corresponding FEM equations are also constructed. An example solved with this method is given at the end. There are three different levels for nonlinear heat characteristics of the material discussed in this example. The results of the numerical example show that the nonlinear factors can be neglected only when the degree of the nonlinearity is very weak, and in most instances the nonlinear factors can not be neglected at all.