Abstract: As a new type of laser source, supercontinuum has become a hot study, owing to its incandescent wide spectra and the brightness of the laser, but the reports of the beam quality are few recently. It inconveniences the application of SC. The method of measuring the beam quality of supercontinuum was put forward by analyzing and comparing the beam quality evaluation methods. The beam quality of a supercontinuum source was measured. The results shows that the beam quality of the supercontinuum source is closely related to the pump power density. The beam quality M2 factor is less than 1.5, when the pump power is small. The beam quality M2 factor is around 1.9, when the pump power is larger. In addition, the beam quality M2 factor of visible part is less than 1.5, and with the increase of the pump power, the beam quality of supercontinuum is getting better, the beam quality M2 factor is maintained at about 1.3.