For the problems of the deficiency of existing recognition model of the Chinese weibo opinion leaders,one detection method of opinion leaders in a dissemination network of the specific topic is proposed.A recognition model based on the forward relations on the basis of information dissemination network is proposed in this paper,and the influence of users comes from their own authority and the support of forwarding user.An experiment of weibo opinion leader detection for about two weeks which is concentrated in a certain topic verifies that this method can effectively detect the opinion leader of the specific topic.