In order to improve dried hawthorn quality,on the basis of the influence factors on hawthorn nutrition analysis,an experimental study of to increase preserving rate of nutrient was conducted by adopting twice common rotation combined design and experiment scheme.Single factor experiments show that there are different degree influences on Vc,reducing sugar,total acid and flavonoids content by air-impingement jet drying.In addition,different optimization solutions are obtained by three factors twice common rotation combined design and experiment scheme optimization test.The optimized Vc content of scheme is: the temperature 55.8 ℃,air velocity 11 m / s,nozzle height 148.0mm,material box width 130mm.Total optimized acid content of scheme is: temperature 54.9 ℃,air velocity 11.0 m / s,nozzle height 137.0mm,box material width 130mm.Reducing sugar content in the optimization scheme is: the temperature is 54.7 ℃,air velocity is 10.5 m / s,nozzle height is 139.2mm,box material width is 130mm.