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Because a ship model surface (SMS) is a large double-curved 3-D surface, the machining efficiency of the current handcraft manufacturing method are very low, and the precision is difficult to control also. In order to greatly improve the machining efficiency and precision of SMS, based on the CAD/CAM/CNC technology, this paper proposed a model of SMS digital manufacturing system, which is composed of five functional modules (preprocess module, CAD module, CAM module, post-process module and CNC module), and a twin-skeg SMS as an example, the key technologies & design principle of the modules were investigated also. Based on the above research works, the first set of 4-axis SMS Digital Manufacturing System in China has been successfully developed, which can reduce the machining time of the twin-skeg SMS from 30 working days needed for the current handcrafting manufacturing method to 8 hours now, and which can control more effectively the precision of SMS also.