In order to describe the non compatibility among the evaluation results of single indexes of optical radiant brightness,the matter element transformation was used for transforing the non compatible problem into compatible problem.On the basis of designing the classical matter element matrixes of each evaluation class and the extensional matter element matrix including all evaluation classes,and calculating the correlation degrees between the standard to be evaluated and each evaluation class.The coincidences of the standard to be evaluated with each evaluation classes were evaluted and the comprehensive evaluation was made further according to the quantities of correlation degrees.The evaluation results are precise and reliable.