Abstract: After investigations on the methods usually used in measuring the spatial light intensity of lamps, a new test method for spatial light intensity is proposed. A data model, which can automatically align the spatial light intensity of a lamp, has been established. The structure and principle of the system for automatically measuring the spatial light intensity are introduced. The threedimensional figures of spatial light intensity were drawn with a 2D scanning system and a dedicated test softwave (Matlab). With the technology we can rapidly derive the lightintensity distribution in x and y axes, and the divergence angle of the lamp. An example of measuring a projection lamp is given in details. The ideal results, among which the peak light intensity is 2634.4 cd and the divergence angle is 15.25°， are acquired in the experiment while a lamp is 5m away from the detector of the system.