This paper studies the resource allocation algorithm for multicasting scalable video coding (SVC) source in WiMax network. In order to effectively utilize the radio resources, the proposed scheme considers the channel condition of each mobile station for the establishment of multicast groups. We considers that a service multicast group, which receive the same service traffic simultaneously, can be divided into several delivery multicast groups in WiMAX network for better radio resource utilization. And the delivery multicast group is designed as a "soft-group" that can be flexibly arranged. The proposed algorithm divides the allocation procedure into two parts in a heuristic way to reduce the computing complexity. The delivery multicast group allocation part applies the willingness to pay and throughput comparison concepts to arrange the subchannel for users. The SVC resource allocation part utilizes the divide and conquer approach to reduce the radio resource consumption. The simulation results show that the proposed scheme can minimize the resource usage according to each receiver's channel condition for better transmission efficiency and can provide fair video quality as well.