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Many people like drinking and tea-leaf is always used for one or two times, much waste tea-leaf is thrown away by us. According to a recent research, I find the new function of the waste tea-leaf: As many people use mosquito coils in summer to drive mosquitoes, mosquito coils bring toxic gas to us and sometimes cause dizzy and sickness. In fact, the waste tea-leaf can be dried in the sun and be made into tea- mosquito coils, waste tea-leaf has lots of Serine, Methylsulfide and some other organic matter, which form tea perfume. When they are burned, its perfume will drive mosquitoes but does no harm to human beings.