Multiple regression analysis was used to study the relationships between site index and site factors In the study area.The results showed that the main site factors were slope position,the depth of humus horizon,the depth of soil horizon and the elevation.The study area was classified into 2 site type districts,6 site type groups and 14 site types.The forecast equation for site index was derived to predict stand productivity of (?) lanceolata.This paper also evaluates the productivity of plantations of C.lanoeolata in different site units of the study area.