Abstract: In order to explore the drying effect of far-infrared drying technology on Platycodon grandiflorum slices, obtain better-quality dried Platycodon grandiflorum products. The far-infrared drying characteristics of Platycodon grandiflorum under different temperature slice thickness and irradiation height were studied, and the drying kinetic model was established to compare the changes of Platycodon grandiflorum drying quality under different drying conditions. The results show that the suitable range of drying temperature is 55 ℃～60 ℃, and the material with a slice thickness of 4 mm has a better drying effect; the weibull distribution function can better describe the far-infrared drying process of Platycodon grandiflorum; effective moisture diffusion of materials under different drying conditions The coefficient range is 1.08×10^-9～6.88×10^-9 m~2/s; compared with hot air drying, the color difference of the dried product obtained by the far-infrared drying technology is smaller, and the change of the drying curve is more gentle; compare different drying technologies The microstructure of the obtained dried Platycodon grandiflorum product found that the cell surface of the dried product obtained by far-infrared drying is flat, the pores are uniform, and the cell damage is small.