Abstract: Morphology of tea flower organ is the main evidence of origin, evolution, heredity and classification of plant. This paper recorded the system studies on morphology of tea flower organ from 500 varieties since 1954. Three main forms of the structure of both sexual differences were classified as low style, plain style and high style by the height differences of pistil and stamen in various varieties. The tendency of evolution and heredity of the structure of both sexes of tea flower were analysed by the constitution ratio of three types of structure in various varieties. As a result, it seems that the structure of both sexes of tea flower evolve from a low style to a high style by the evolution of varieties. The structure of low style type or plain style type belongs to the type of stock, and it has the stable heredity.