In this paper, with the laser side irradiation of the NCFs, the forward scattering patterns can be obtained through the scattered spectra. Some characteristic values of the scattering patterns are introduced, and they correspond to the integral intensity of the electric field and are closely related to the azimuth. We proposed two methods to determine the azimuth of monolayer and bilayer NCFs, and the corresponding errors are less than 2° and 1°, respectively. In addition, we discussed the influence of the structural parameters of the NCFs and the relative position of the screen, and the results show that the methods have universal applicability and screen position insensitivity. The methods can be applied to the online azimuth determination of the NCFs without damage and pollution to the NCFs.