Financial system is more s political than economy system.What we argues is to establish a democratic politics corresponding to the market economy.Supervision of financial expenditure is an important rule granted by the Constitution and the law,though there some problems in the implementations of it.For today's harmonious society,finance is a big problem and supervision is a protection for the correct action.In the meanwhile,well management of the finance means to protect the smooth operation of national economy.This paper analyzes the shortcomings in the present legal system of financial supervision and then acquires the measures to illustrate the importance and urgency of financial expenditure supervision.