Aiming at the characteristics and purpose of beam homogenization, existing evaluating methods for beam uniformity are analyzed, and their disadvantages are discussed. An assessment method combining uniformity and stationarity is introduced. The laser intensity distribution is obtained by CCD and the laser spot is analyzed by image processing. Then we quantitatively analyze the energy distribution and speckle of laser spot with uniformity and stationarity. The result indicates that the testing system fully satisfies the demand of laser spot assessment.