With the rapid development of economy and society, China's budget system needs to be reformed. Medium-term fiscal planning is a transitional form of the medium-term budget, which is of great important to comprehensively deepening reform of finance and tax system. It is of great significance to the development of the national economic system. At present , the growth rate of fiscal revenue in China has declined, and the contradiction between fiscal revenue and expenditure has intensified. Especially in the formulation of medium-term fiscal planning exist many difficulties, which is not conducive to the realization of scientific financial budget planning. In order to realize the and feasibility of the medium-term financial plan, the national financial department should develop the financial legal plan with all levels of departments in the next three years, jointly predict some major financial revenue and outflow, manage the main decision-making, legal system mechanism and financial evaluation participation plan, solve various financial risks, and realize the scientific development of the financial plan.