The maintenance of farmland water conservancy projects has always been a difficult problem in the comprehensive reform of agricultural water price.The problems of the farmland water conservancy projects in small and microirrigation areas of Jiangxi province are generally lack of management and protection subjects，extensive management methods and low efficiency of fund use.Zhanggong district has explored its specific supply and marketing model according to its own situation.The supply and marketing cooperatives undertake the maintenance of farmland water conservancy water source projects and backbone projects and the district finance provides the start-up funds of the maintenance for the supply and marketing cooperatives and incorporates the maintenance funds into the annual financial budget combined with the subsidy funds for the comprehensive reform of agricultural water price at the higher level and the management and protection funds after the construction of high-standard farmland.According to preliminary statistics，the participation of supply and marketing cooperatives in the operation and maintenance of farmland water conservancy projects achieves three “30%” effects，that is，the operation and maintenance cost of farmland water conservancy projects decreased by 30%，the use efficiency of financial funds increased by 30%，and the average service life of channels in the whole area extended by 30%.