Interplanting silage corn during the late field growth stage of flue-cured tobacco(after the harvesting and curing of the lower second canopy tobacco leaves)is a planting pattern that has been actively promoted in the tobacco-growing areas of Yunnan province in recent years.The impact of interplanting silage corn on flue-cured tobacco production and tobacco leaf quality was studied from the perspective of the yield and quality of upper tobacco leaves.The results showed that，compared with single cropping of flue-cured tobacco，interplanting silage corn after the harvesting and curing of the lower second canopy tobacco leaves of flue-cured tobacco had no significant impact on the agronomic traits of the upper tobacco leaves；the nicotine and chloride ion contents of the upper tobacco leaves were reduced by 9.34% and 21.88%，respectively，and the nitrogen-nicotine ratio and potassium-chloride ratio of the tobacco leaves were increased by 25% and 28.73%，respectively；there was no significant impact on the plastid pigments of the tobacco leaves；at the end of the harvesting and curing period of flue-cured tobacco，the contents of organic matter and available phosphorus in the rhizosphere soil were increased，and the contents of alkali-hydrolyzable nitrogen，available potassium and chloride ions in the soil were significantly reduced.It indicated that interplanting silage corn with flue-cured tobacco was conducive to improving the chemical quality of tobacco leaves，and had no significant impact on the yield and output value of tobacco leaves.At the same time，it could significantly reduce the content of alkali-hydrolyzable nitrogen in the soil in the late stage of flue-cured tobacco growth，which was conducive to the yellowing，ripening and quality improvement of the upper tobacco leaves.