Abstract: [Objective] This project aims to research the effect of water deficit on the yield of jujube in different growth stages under drip irrigation, and to determine the water sensitivity index of each growth period, and to determine the critical water requirement period.[Method]This paper analyzed the relationship between water consumption and yield, and the effect of water deficit on yield in different growth stages.Based on the relationship between jujube yield and water consumption in different growth stages, the water production function based on Jensen model was established.[Result]Jujube water sensitive indexes (bud and leaf 0.089;flowering stage 0.324;fruit enlargement period 0.392;mature period 0.068) were determined.[Conclusion]The fruit enlargement period is the critical period of water requirement, and water deficit during the germination and mature stage has little effect on the fruit yield.