Based on non-Fourier's law of heat conduction, by using the expansion method of wave functions, the thermal wave scattering by subsurface cylinders in the opaque body is investigated. A general solution of multiple scattered waves in solids based on wave equations of heat conduction is given. The thermal wave is excited at surfaces of opaque materials by modulated optical beams. The circular cylinder is taken as a cavity with thermal insulation conditions. The effects of different geometric and physical parameters on the temperature distribution, and especially the effect of thermal wavelength on the temperature are analyzed. The model can be applied to the infrared radiometry technique and photothermal wave imaging. And also it can be used to determine the distribution of the defects by the laser detector.