The parameters of laser beam is important to laser and laser optical system. The difficulties and price of measure system are increase with the aperture of laser beam increases. In this article an approach to measure the large-aperture laser beam parameters by using large array lens is given, the principle of measurement and the structure of system are introduced, the parameters of array lens and imagine system are discussed. A experimental equipment of large-aperture laser beam wavefront measurement system is designed, the wavefront aberration of a laser beam is measured and compared by array-lens and interferometer. The feasibility of the method is jestified by result of experiment.