E-commerce becomes more popular in recent years, and changes a lot of consumers’ payment habits. Despite the popularity of Taiwan's consumer internet usage, online shopping uncertainty still higher than physical stores. Therefore, third-party payment platforms are blossoming. It guarantees the transaction security of both buyer and seller, and ensure the normal operation of capital flow and logistics. Also, it reduces the trade disputes. Third-party payment has impacted on the financial system in Mainland China. This thesis will analyze the effects on the banking industry after Taiwan promulgated the Act Governing Electronic Payment Institutions last year. And in the near future, the main niche areas for competition in the third-party payment industry will be O2O payment and cross-border payment.