-This study aims to know a function or functions that can be applied to predict the height increment of Pinus mercusii in the community forest in Tana Toraja. The analysis result showed that the best function to height increment estimation of this species, is Y = 33,766 ??? ???28,215 exp(-0,001t2,308)???; and the maximum height increment estimation function of this species is: Ymax = 34,579 ??? ???28,041 exp(-0,001t2,647)???; where Y and t are height and yea