Aimed at un-uniform line intensity of laser beam line generator caused by Gaussian distribution of based mode intensity, a new method replacing the based mode with higher-order mode such as TEM20, TEM40 was presented in this paper. The intensity distribution at one of the orthogonal directions of such higher-order mode is the overlapping of several Gaussian distributions. It is more even than single Gaussian intensity distribution of based mode. More short the distance between the near Gaussian apices, more even the intensity distribution of the higher-order mode. The higher-order modes were got by moving transversely laser diode (LD) apart from the axis of the resonator in the experiment. The distance between the near Gaussian apices is controlled accurately by controlling accurately the divergence of LD. At 1 m working distance of laser beam line generator, the data of line intensity were obtained when based mode and higher-order mode incidence acted as the source respectively. The data proved that the overlapping intensity distribution of higher-order mode could improve the line intensity uniformity.