Taiwan's Coastline Safety Agreement just newly amended. Water sport would become main issue of whether or not national security bargaining in Taiwan success and how far it can go. The aim of this research has three aspects. One is through the study in Taiwan to examine and evaluate the risk of the content and process of scuba diving. Another is to explore the eligibility of a qualified diver in practices under water. The third is to discover the safety code and actual experiences for the eligibility and requirement of scuba divers in Taiwan. The main argument of the study is that scuba diving is the first step towards the establishment of coastline safety agreement, but this is the step influenced and impacted by international diver training organization.