This paper is a study on standard testing method for type approval of DSC which is the main structure of the terrestrial communication. As authority inspecting offices and producers have no experience for type approval of relative equipments as adapting GMDSS. In this paper, it is to be improved the understanding for type approval ; a system, standard of technic and testing methods, etc and make better quality of relative equipments. Additionally it could help quality and quantity improvement in all radiocommunication parts. Of course, the regulation for type approval had made but most makers didn't know it correctly, so the method of solution have been studied. By result of this study, with comparision and analysis of structure and a condition of efficiency with adapting GMDSS is could help some problems slove in the field and gave testing method of machinery and tools, electrical conditions, came out measurement and did ways standard efficiency.

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