In order to explore the suitable irrigation system of Korla Fragrant Pear orchard under labor-saving cultivation mode, based on the two-year field test data of Fragrant Pear under four irrigation quotas (3 750, 5 250, 6 750 and 8 250 m³/hm²), the AquaCrop model parameters were determined through using canopy coverage, soil water content, evapotranspiration (ET_a) and yield index. Different irrigation scenarios were set up, and the yield, water use efficiency and yield were comprehensively considered, AquaCrop model was used to optimize the irrigation system of fragrant pear. The yield of Y2W3 treatment was 3.87%~16.86% higher than that of other treatments, and the water use efficiency of Y2W3 treatment was 2.88%~27.20% higher than that of other treatments. The evaluation indexes of determining coefficient (R²), root mean square Error (RMSE), standard root mean square error (NRMSE), the Willmott's index of agreement (d) and Nash Sutcliffe efficiency (NSE) of the simulated and measured results of AquaCrop model showed that the canopy coverage R² ranged from 0.89 to 0.93, the range of soil water content d was 0.92~0.98, the range of ET_a RMSE was 1.06~1.61 mm/d. The AquaCrop model predicted 15 different scenarios, and the irrigation system with irrigation quota of 7 200 m³/hm², irrigation frequency of 11 times and irrigation cycle of 14 days performed best, with a yield of 6 793.62 kg/hm², water use efficiency of 10.90 kg/(hm²·mm) and irrigation water use efficiency of 1.03 kg/m³. AquaCrop growth model could be used for yield prediction and field water management of fragrant pears, and the results could provide a basis for the applicability selection of surface drip irrigation technology.