60 GHz is one of the potential candidates in frequency spectrum for high-speed wireless communication. Geometrical optics in frequency domain (FDGO) is suffered from relative low accuracy and time consumption for frequency sweeping. In this paper, 60 GHz indoor propagation is studied with the time-domain geometric-optics (TDGO) method. The influence of slab walls with layered structures is considered. The accuracy of TDGO is validated by finite difference time domain. The result is compared with the results of FDGO and experiment in references.