Abstract: This paper deals with the morphology and life cycle of a new species of Chloromonas sinica H.J.Hu et C.T.Yin (Chlamydomanaceae,Volvocales) from Wuhan,P.R.China.The alga (smaller discoid chloroplast and special habitate ) seems to be morphologically rather distinct from the other members of Genus Chloromonas. The investigation of the life history of this alga in the cultural condition reveals vegetative division,asexual reproduction and sexual reproduction which is homothallic,heterogametic and produces smaller male gametes and larger female gametes.The study has proved that there are not pyrenoid on the chloroplast in the all stages of the life history of this alga.Therefore,Chloromonas as a taxa is valid genus.