Abstract: Taking A.vulgaris harmed by S.prunastri as the material with two-factor randomized block experimental design, the population density of S.prunastri and the new shoots growth of A.vulgaris in different pruning time（spring, summer, autumn） and intensity（light, medium, heavy） were investigated, in order to explore reasonable pruning time and intensity.The results showed that pruning time and intensity had effects on the population density of S.prunastri and the growth of A.vulgaris.In the control effect of S.prunastri,the results showed spring pruning＞summer pruning＞autumn pruning, heavy pruning＞medium pruning＞light pruning.In the effects of new shoots growth of A.vulgaris,the results showed autumn pruning＞spring pruning＞summer pruning, heavy pruning＞medium pruning＞light pruning, but medium and heavy pruning in autumn was not conducive to survival of A.vulgaris.In conclusion, the most suitable pruning time and intensity is the medium or heavy pruning of A.vulgaris in spring by analyzing from the two aspects of the control of S.prunastri and the growth of A.vulgaris.