Abstract:The No. 11 masson pine trees in a massonian pine forest located in Yulin, shows significant resistance to D. punctatus This pine tree showed a nonpreference egg-laying of the moths and an adverse effect on the growth of the larvae. Biochemical analysis shows that there are significant differences in the amount of β-pinene, amino acids, carbohydrate and mineral components among the leaves of the pine trees and those of the other masson pine trees. These differences are supposed to be the main factors for the No.11 masson pine‘s resistance.