Abstract: Regression simulation was carried out to study the sugar accumulation in the spring planted sugarcane.It was found that sugar accumulation highly coincide with parahola curve.With the decreas of tmperature after the end of September,conversion of vegetative growth into physico-ogial maturity was underwent by cold stress.October was the key period to sugar accumulation.In addition,the earier sugarcane was planted in Spring, the more sugar was accumulated.The effect of plantng season on sugar accumulation was different from 5 tested varierties.With sugar accumulated more and earlier,F.I.83-13 was a constituously high sugar variety in the whole maturing stage,Although M.T.70-611 had high sugar content in the eraly stage,it is recommended to be harvested earlier because this variety has weakness of senescence and degrading sugar in the later stage, In spite of low sugar content in the early stage due to the more tillering stalks,F.I.79-9 rapidly accumulated sugar after the middle October.F.A.82-1112 and F.I.82-7 had lower sugar content than the other tested varieties.