In order to provide information on improving the chemical qualities and security of tea leaves,the effects of Ca and Al regulation on main chemical qualities of tea leaves and Ca,Al,Zn and Fe uptake and accumulation in tea plant were studied using water culture experiment with one-year cutting seedlings of variety fudingdabai.The results showed that:(1)Suitable Al addition (10 or 20 mg·L^-1) increased tea polyphenol,caffeine,flavone,total soluble sugar and amino acid contents of tea leaves.The Ca addition increased these chemical qualities of tea leaves under all Al treatments,especially at higher Al addition.Suitable Al addition promoted Al and Fe uptake and accumulation of tea plants,while higher Al addition (30 mg·L^-1) decreased Al and Fe contents.(2)The Al addition decreased Ca and Zn uptake by roots of tea plants,but suitable Al addition had no effect on Ca and Zn accumulation in shoots and leaves of tea plants.(3)The Ca addition increased Ca uptake and accumulation,decreased Al uptake and accumulation of tea plants and Zn content of tea leaves,and had no effect on Fe uptake and accumulation.These results suggested that Al and Ca can respectively and interactively regulate chemical qualities of tea leaves and microelement uptake of tea plants.Suitable Ca addition might be beneficial to increase chemical qualities of tea leaves and to establish ecological and efficient tea plantation.