In the financial industry , typical indirect-financial institution attracts deposit, inter-bank loan, or issuing negotiable certificate of time deposit and bonds.¡@After collecting money from excess capital units through auditing procedure then loan to the needed parties as a financial intermediary in the market. The roles of financial institutions such as banks are acting as a financial intermediary by providing buy-sell funding to enterprises or individuals. Those banks actually take whole funding liquidity risk to exchange main resource of bank¡¦s profitability. Once failure in managing risk or facing dynamically financial environment changing, bank may engage in difficulty and cause serious financial crisis. Comparison with large international financial institutions, our financial institutions hold a lot of NPL (Non-Performing Loan; Taiwan major NPL almost came from mortgage), it not only lower the liquidity of fund, longer payment duration but also raise operation risk can¡¦t recover financial assets. The quality of asset has also been worse off rapidly. These phenomena raise financial institution operation risk and influence stability of financial system and development of financial environment. With the financial environment is changing, those developed countries mostly adopted structured finance or financial asset securitization methods. The purpose of financial asset securitization in general is to raise fund for originator. Originator is the most important participant on the securitization process. The originators pool and reorganize those assets, which could create cash flow into small-amount unit security and sell to the investors. By this way originator don¡¦t have to wait till maturity and buyback those securities. That is why by using financial asset securitization will help financial institution to improve asset/liability management, spread asset risk and increase the ratio of equity to assets. At the same time, this will improve the effect and efficiency of finance institution¡¦s operating and open up the funding market. Mortgage securitization can raise banks¡¦ capital adequacy and current ratio. By way of asset securitization, the originators enjoy higher asset liquidity, lower funding cost, and improved capital ratio; while investors can use mortgage-backed securities to diversity their portfolios, improve liquidity and enhance yields. For originators, securitization is not only lower the cost of capital, increase the net profit but also enhances the liquidity of cash and balances the assets¡¦ structure. Assets-backed securitization has been prevailed in USA for years. It effectively controls the NPL (Non-performing Loans) problem and stabilizes financial management. Through financial asset securitization optimal asset allocation model, this thesis has the following finding: 1. Financial market funding supply shows multiple effects after Banking Financial asset securitization. In the initial stage of securitization, banks will lower risky assets and then will increase to original size. 2. After Financial asset securitization, a capital adequate ratio will rise first then become normal level. 3. Under assumption that financial asset securitization does not create any capital gain or loss; bank will lower profitability at initial stage. Then after a while, profitability will increase dramatically later. 4. After consideration of risk, this research discovers that securitization wills steeper Capital Allocation Line. It means every risk taking will compensate higher return. Improve Banking efficiency and profitability. Securitization provides a groundbreaking tool to increase profitability and avoid risk. Under MBS structure, the commissions and fees, absolutely out of risk, is major and stable income of the bank. On the other hand, the successful development of USA RTC implement is another contribution to resolve NPL. In sum, financial asset securitization not only accelerates the efficiency of financial institutions for more balance capital markets but also avoids financial risk in the banking system. At present, the prime theme of he banking sector should be how to maintain sound operations by strengthening credit risk management and restructure assets quality. Introducing successful external professional partner system is another way to deal with NPL problems.