China has established a relatively well-established system for social health insurance access and payment standards，but the entire decision-making process is still based on a single source of information. There is a lack of a national health insurance big data system to analyze the data to aid decision-making. The role played by the Korean health insurance big data system in the whole process of pre-access，mid-access and post-access to health insurance is examined. It aims to study the function of South Korea's healtheare insurance big data system before，during and after access by taking Ticagrelor，manufactured by AstraZeneca South Korea，so as to provide references for the construction of health insurance-related big data systems in China and their future application in health insurance decision-making.