This paper firstly attempts to study the role of policy finance in the process of economic development, then to discuss the hidden defects of the domestic medium-long term fund market, and to inspect the constraints of the arrangements of the insurance fund. The empirical data exhibits when insurance industry decides to arrange their portfolios, they must encounter multiple and strict constraints. McKinnon and Shaw had named this phenomenon as financial repression, and it makes insurance industry can not function well in the financial intermediation process of medium-long term fund market, then to reduce their contributions to economic development and capital accumulation. This paper suggests the authority should adjust the working pattern of current policy finance, and provides a safe channel to induce the insurance fund to transfer its inefficient utilization. This adjustment will release the financial repression imposed on the insurance industry, and may be helpful to induce the insurance fund to invest in productive capital. Then the increase of the efficiency of the utilization of insurance fund should improve the financial intermediation functions of medium-long term fund market.