Abstract: 【Objective】 By adding chitosan to the pollination solution of Korla Fragrant Pear, the effects of plant immune inducer chitosan on pollen viability, fruit setting rate and fruit quality of Korla Fragrant Pear were investigated, and the most suitable concentration of chitosan was screened out in the hope of providing a theoretical basis for the rational use of chitosan in production to improve the pollination efficiency and fruit quality of Korla Fragrant Pear. 【Methods】 With pollinated pollen (Yali pear pollen ) and Korla Fragrant Pear tree as test materials, pollen in vitro germination method and field artificial liquid pollination method were used to study the changes of pollinated pollen vitality, fruit setting rate and fruit quality of Korla Fragrant Pear treated with 7 concentrations of chitosan. 【Results】 When the concentration of chitosan was 0.25-1.25 mL/L, the pollen germination rate, fruit setting rate and fruit quality could be improved, and 0.5 mL/L was the best.Through independent analysis of each quality index and principal component analysis of fruit quality, it was concluded that 0.5 mL/L chitosan improved the quality of Korla Fragrant Pear while increasing pollen germination rate and fruit setting rate. 【Conclusion】 It is recommended to add 0.5 mL/L chitosan as the most suitable amount in the pollination solution of Korla Fragrant Pear.