It is short of water resources in Ningxia，and the economic and social development mainly rely on the limited waterfrom the Yellow River. Recently，the water rights transfer is done mainly by the lining channel to achieve water -saving. Thesaved water is used for industrial projects.lt is mainly to reduce leakage through the use of lining material. Thus soil waterevaporation and phreatic water evaporation are reduced. Water-saving coefficient is the key parameter in calculation of liningchannel water amount. In this paper，two methods were used to analyze walter -saving coefficient in different irrigation areas inNingxia.The advantages and disadvantages of the two methods were also expatiated. And the suitable water-saving coefficient inNingxia water transfer water quantity calculation was put forward.