Abstract: Dosage of rare earth was researched on flue-cured tobacco in order to provide the basis of the promotion, take variety Longjiang911for material, the influence on the growth period, botany properties, field agronomic traits and economic characters of tobacco plant were observed. The result shows that： spraying rare earth can improve the quality of flue-cured tobacco, in which diluted 900 times have best perform at the comprehensive quality, agronomic traits and economic characters of tobacco plant.