Abstract: By secondorder and thirdord er p erturbation theory, the interaction rates of intense laser fields at wavelength of 193 nm and 355nm with the conductionband electrons of fused silica are calc ulated. Compared with the linear absorption of the conductionband electron sim ultaneousely absorbing or emitting an acoustic or a longitudinal optical phonon, the linear absorption simultaneousely scattering off a hole and the twophoton absorption are also important in the process of the electrons tr ansferring　laser energy to solids.