Abstract: The chemical components and sensory quality of Samsun aromatic tobacco leaves were studied in various ecological regions. The results showed that chemical component contents varied largely with different ecological regions. The total sugar and reducing sugar contents of oriental tobacco leaves in Yunnan and Sichuan were significantly higher than those in Zhejiang and Turkey, and nicotine content was significantly lower in Yunnan and Sichuan than that in Zhejiang and Turkey. There were significantly difference in contents of sugar and nicotine of aromatic tobacco leaves between Yunnan and Sichuan. Malic acid and citric acid contents in aromatic tobacco leaves were higher in Yunnan, but oxalic acid content was higher in Zhejiang. The content of oxalic acid was higher obviously in aromatic tobacco leaves AB grade of Turkish than in that of China. Total content of nonvolatile organic acid in aromatic tobacco leaves was quite different under different ecological regions and varieties. The sensory quality of Chinese Samsun oriental tobacco leaves, from high to low, was Zhejiang > Yunnan > Sichuan, and lower than that of AB grade oriental tobacco leaves in Turkey.