The paper reported pollinating insects species of soybean male sterilelines in Gongzhuling area.The best pollinator is alfalfa leafcutting bee, Megachile rotundata,introduced from Canada among leafcutting bees. M.rotundata,was used to pollinate soybean male sterile plants in cages and fields during 1998~2001,the percent of seed set are over 70%and 75%in cage and fields respectively,comparing with normal soybean plants.The paper also discussed how to raise the seed set of soybean male sterile plants.