Internet has led to the development of e-commerce, changed the type of payment, but also raised new issues. The use of third-party payment service has not only successfully resolved the risk of information asymmetry and privacy leakage during the internet transactions, but also benefited the e-commerce. However, due to the restriction of relevant regulations and supervisory authority in Taiwan, the use of third-party payment service hasn't drawn much attention to the public until recently. In this paper, we will identify the trend of third-party payment service by observing the development of Paypal and Alipay, then analyze third-party payment regulations in the United States, European Union and China, in the end we will make recommendations in the aspects of market-access mechanism, customer funds management, consumer protection and anti-money laundering.