Quantitative measurements of transmitted second harmonic generation (TSHG) through the germanium thin film versus the angle of Polarization of incident light from the interface between germanium film and K9 glass are presented. We calculated the intensity of TSHG by the boundary conditions and sipe′S hydrodynamics model, and found that the phenomenological parameter “a” which estimates the size of this normal components of the harmonic current has varying value with angle of incidence.