Abstract: The theory of statistical inferences for linear model was employed to test the effect of Chinese fir provenances on site index curves (dominant height-growth curves).The results of analyzing two experimental farms,Hongya and Jigongshan,showed that,(1)both site indices of different provenances in the same region and those of the same provenances in different regions were both of significant difference,which suggested that variation in site indices was a combination of variation both in genetics and in environment.(2)The slope parameters of site index curves for different provenances were of no significant difference,which meant that the dominant heights of different provenances followed the same growth development.Consequently the dominant height-growths of different provenances could be described by a similar growth model,which provided good evidence in support of the universal applicability of Chinese fir growth and yield models.