Abstract: In order to explore the relationship between the growth characteristics of Cunninghamia unica plantation and soil factors, variance analysis and correlation analysis were used to analyze the difference and correlation between growth traits and soil chemical properties of Cunninghamia unica plantation in Dechang, different areas with the same stand age and different stand ages in the same area. The results showed that there were significant differences in the growth characteristics of Cunninghamia unica of the same stand age in different regions, and there was no significant correlation between the growth traits and soil factors. There were significant differences in growth traits of Dechang Cunninghamia unica with different stand ages in the same area, among which the annual growth of DBH was extremely significant positively correlated with the soil total potassium, and the annual growth of tree height is significant positively correlated with total potassium.