Tomato is rich in nutrition and unique in flavor．It is one of the largest consumption vegetables
in the world．Recently，people have increasing requirements on tomato quality．Chemical components
affecting tomato quality include sugar，organic acids，vitamin C and carotenoids，etc. metabolites，
determining the unique flavor，nutrients and appearance quality of tomato fruits and affecting the commodity
quality of tomato products．This paper expounded the metabolic pathway and internal regulatory mechanism of
these metabolites，aiming at providing new ideas and methods for improving tomato quality.