In order to clarify the relationship between color parameters of tobacco leaves and the curing characteristics，changes of color parameters and curing characteristics of upper leaves of flue-cured tobac co NC55 and NC102 with harvesting time were studied.The correlation and regression analyses of color parameters with yellowing index and browning index were carried out.Curing characteristic regression models based on color parameters of tobacco leaves were established and tested.Ｒesults showed that，with the passage of harvesting time，the color parameter L value(brightness value) ，b value(yellowness val ue) ，C value(saturation value) of flue-cured tobacco leaves of varieties NC55 and NC102 increased in a whole，H°value( color phase angle) tended to decrease totally，a value (redness value) decreased first and then increased.The yellowing index increased，and the browning index decreased first and then in creased.The curing characteristics at a certain stage were better than those in other stages.Color parame ters had extremely significant or significant correlation with yellowing index and browning index，and the curing characteristic regression models based on color parameters of tobacco frontal leaves had better pre diction effect.It was feasible to establish a regression model based on the color parameter of tobacco fron tal leaves to predict curing characteristics．