Abstract: A cablenet design method is proposed for the calculation of a large span deployable antenna cable-beam structure system, and this method can make the antenna cablenet design with the consideration of beam’s effects. In order to improve computational efficiency, the cablenet of antenna is divided into an inner cablenet and an edge cablenet. The inner cablenet is the antenna cablenet area with a high shape precision requirement, and the balance matrix analysis method is used for the optimization calculation of this type of cablenet to find out its optimal pretension distribution. The edge cablenet is another antenna cablenet area that connected with outer beams, and a combined iterative method of the balance matrix analysis method and nonlinear finite element method is used for the calculation of the edge cablenet to gain its reasonable pretension distribution. In every iteration step, the shape of the edge cablenet is updated by a calculating displacement of connection joints between the edge cablenet and outer beams, and through recalculating the pretension distribution of the edge cablenet with new shape, the effects of the antenna beam can be added into the cablenet design. The method is programmed for a deployable antenna’s calculation at last, and the results indicate that the method is feasible.