Abstract: The effect of different degree of pruning on constitute of shoot types and fruiting was conducted on 10 –year-old Red Fuji apple trees on M. 26 interstock. The results showed that middle and long shoots was increased, the yield was decreased, fruit quality was improved, flower formation was increased, and trend of biennial bearing was decreased when pruning in modifying tree form was increased heavily. But when pruning was too heavy, it will stimulate tree growth more vigorously, fruit quality was decreased, and flowering were decreased. The suitable pruning in modifying tree form is cutting 50%~60% total shoots. Bending shoots heavily and exercising summer managements are necessary measurement after modifying tree form.