Based on the beam characteristics of supercontinuum laser,several beam quality evaluation methods for output beam quality of supercontinuum laser are analyzed,and the merit and demerit of every method are summarized. The most adaptive method of measuring the beam quality of supercontinuum laser was put forward by analyzing and comparing those evaluation methods. To improve the beam quality of supercontinuum laser,there are two methods. One is to adjust the intensity of the beam into a nearly Gaussian distribution,and the other is to compensate the wavefront aberration of the beam. The method of compensating the intensity is the gain guidance effect,and the compensation methods of wavefront aberration include the phase conjugate mirror,the deformable mirror,and so on. The spherical aberration can be compensated by the spherical aberration corrector,then the beam quality can also be improved.