Abstract: In order to determine the optimal pruning time and pruning measures of Carya illinoensis in summer, taking 5-year-old grafted seedlings of Carya illinoensis‘Pawnee’as experimental materials, effect of different pruning time, different pruning measures on budding number and branching ability of Carya illinoensis‘Pawnee’were studied. The results showed that the uncut branches had no budding, but pruning branches had a certain number of budding. On June 14, 1/5 short-cutting had the best effect for the 20-50 cm annual branch, the average budding number was 1.67, branching ability (10-30 cm) reached 73.3%, and had ＞ 30 long branches; 1/3 short-cutting had the best effect for the ＞ 50 cm annual branch, the average budding number was 2.75, branching ability of 10-30 cm and ＞ 30 cm reached 68.18% and 18.18%. On June 28, 1/5 short-cutting and 1/3 short-cutting had the best effect for the 20-50 cm and ＞ 50 cm annual branch. Therefore, 1/5 short-cutting for the 20-50 cm annual branch and 1/3 short-cutting for the ＞ 50 cm annual branch of pecan‘Pawnee’young tree on June 14 were conducive to the formation of pecan branches.