Abstract: Under the conditions of known thermophysical properties of mediums and supposed some thermal contact resistances of interface between two layered infinite complex mediums, the inside temperature distribution of medium and the temperature raise curve at the two-concave-di sk target's back surface center is computed numerically when the front surface is irradiated by laser. And the temperature raise curve is also measured experiment ally. The thermal contact resistance of the interface is determined by comparing the experimental data with the computed results. Through numerical computation, it is found that the concave disks accord with the supposition of infinite slab and the effect of thermal expansion on the interface thermal contact resistance is very small.