After ROC and mainland China's entering into the WTO, the cross-strait economic cooperation will further expand and develop, and it will also have great impact on the two-sides financial affairs. The government has replaced its previous ”go slow, be patient” policy with a new policy of ”active opening, effective management” on trade and investment with mainland China. ROC's global market strategy also embraces newly cross-strait economic ties. Therefore, important changes will be made on the structure of cross-strait financial affairs. This article will discuss the impact on cross-strait financial business affairs resulting from commitments on financial service industries, cross-strait financial affairs promoted by the government and mainland China's financial institutions setting up branches on ROC, and would also provide suggestions on possible issues which the government would face.