Evidence classification strategy can resolve the conflict evidence combination problem. To classify the evidences and make sure of the uniformity of the evidences in one class, this paper gives the definitions of evidence-attribute support degree、classification threshold、evidence believe degree. When a series of beliefs are available, D-S rule in inner class is adopted, and the weights of every class according to the number of evidence in each class and the uncertainty of evidences are obtained, then all the combination results are integrated with weight rule to form the final results