Boring the process of curing of the tobacco ( Nicotiana tabacum L. clicks) leaf, the and other fundamental components of the tobacco leaf was observed The amount of total chlorophyll was reduced from 2902$mu extrm{g}$/gr to 1, 131$mu extrm{g}$/gr as a function of curing time. In the case of total carotene, the concentration was increased from 373-712$mu extrm{g}$/gr. to 3, 003~2, 215$mu extrm{g}$/gr. up to 70 hours of curing period. However, after 70 hours of curing, the concentration of total carotene stared to be decreased up to 1, 050~1, 039$mu extrm{g}$/gr. Simultaneously, the greenish yellow color becomes to be close an intermediate color between yellow and orange. The amount of total nicotine and nitrogen (2~2%) in the green harvested leaf was essentially identical after the curing process. However, the amount of total sugar was enhanced from 17%, in the green harvested leaf, to 35% at the time of 70 hours curing. At the end of the curing, the amount of total sugar was again reduced up to 16%. The correlation coefficient (r) between the axis of the color coordinate and the ratio of chlorophyll/carotene was estimated to be r=-0.96. This result indicates a linear relationship between those two parameters and the following linear equation is obtained as y=28.87-68.38 x. From the above equation, x=0.442 could be estimated when chlorophyll was completely decomposed (ylongrightarrowO). As a consequence of this result, we can suggest the tobacco leaf of Hicks belongs to the high quality level.