The financial system of China has gone through big adjustments after 1979's economic reform. With the deregulation of government policies, various types of financial institutions burgeoned and foreign banks returned gradually. After joining the WTO in December 2001, Chinese financial market opens to outsiders with schedule and foreign institutions begin rushing into the market. As the deadline of opening market to foreign countries becomes closer and closer, foreign banks investing in China accelerate. However, the Taiwanese banks are allowed only to set up representative offices but cannot open the business branches in China right now, and the business advantage of banks is losing gradually. The paper first introduces recent reforms of China's banking industry, and discusses its current situation and future development. Next, the paper summarizes financial laws of China regarding to opening the market to foreign banking industry and presents the current situation of foreign banks over there. Finally, this paper discusses possible modes of Taiwanese banks investing in Mainland China.