In 2000 and 2001,The Financial Institution Merger Act and Financial Holding Act were legislated in Taiwan. There are 15 financial holding companies established till now. Financial holding companies hope to diversify financial commodities to investors through joint-marketing and gain cost-saving and risk-control and improve financial performance. It expects to pursue and promote broad business scope. Cathay Financial Holding company, one of the financial holding companies, is the biggest financial holding company except the Taiwan Financial Holding company. Cathay Financial Holding company has total assets exceeding NTD 3.68 trillion. The subsidiaries of Cathay Financial Holding company include Cathay Life Insurance, Cathay United Bank, Cathay Century Insurance, Cathay Securities, and Cathay Venture Capital. The financial performance of subsidiaries of financial holding company becomes more sensitive due to competition of financial liberalization and macroeconomic variables changed. The research not only uses a multiple-regression model and reported here was trying to examine the macroeconomic variables that determine the financial performance of subsidiaries of Cathay Financial Holding company, but also uses a managing capital method EAR to discuss the risk-control of Cathay Financial Holding company. Keywords : Financial Holding company, financial performance, macroeconomic variables, managing capital, EAR