Abstract:Abstracts:The correlation analysis between tree character and root system character of Carya illinoensis was conducted in this paper. The results showed that a significant positive correlation existed among the four characters including ground diameter, graft diameter, crown diameter, and the first branch length of Carya illinoensis.The correlation existed among five characters including ground diameter, ratio of fresh weight, lateral root fresh weight, fibrous root length and total weight of root system. The correlation among the lateral root fresh weight, lateral root length,lateral root diameter, fibrous root fresh weight, fibrous root numbers, total weight of root system and total numbers of root system was significant.