Abstract: Based on the research results and literatures in recent years,the uniqueness of the climate for the cured tobacco in Yunnan Province was demonstrated by using tobacco ecology and cultivation theory,and the cause of the climate formation,and the advantage and the disadvantage of the climate for the quality peculiarity of Yunnan flue-cured tobacco was analyzed.The importance of the matching and the distribution of the radiation,temperature and precipitation during the field growing season were emphasized.Generally the climate conditions including the radiation,temperature and precipitation during the tobacco growing season did not have any advantages.But the matching and the distribution of the radiation,temperature and precipitation during the field growing season were unique,which was the main cause of the climate formation for a high flue-cured tobacco quality in higher sugar content,moderate nicotinamide and nitrogen content,partial low petroleum aether extract,and low kalium and chlorine content.The compensative effects of the radiation for the temperature increased the effectiveness of the temperature in the middle and high altitude regions.The application of the plastic film mulching in tobacco cultivation had a calefacient effect.These were the important reason that the flue-cured tobacco growing in Yunnan Province expanded to the upper limit of the altitude for tobacco growing with larger suitable growing areas.

Key words: Flue-cured tobacco, Flue-cured tobacco, Climate, Quality of tobacco leaf, Yunnan