When 50 ×10 -6 gibberellin was sprinkled in full -blossom period , fruit setting rate of Sorbus pohua-shanensis (Hance) Hedl.could increase by 9.5%, and the fruit setting rate could increase by 17.3.5%with 300 times liquid of PBO growth regulator .When 50 ×10 -6 gibberellin was sprinkled in whole -plant full-blos-som period, fruit setting rate of Viburnum sargentiivar.calvescens could increase by 22.71%, and the fruit set-ting rate could increase by 14.93%with 300 times liquid of PBO growth regulator .With Prunus sibirica、Pyrus serotina Rehd.cv.Hengshan as the research object , whole tree were sprayed with hormones 25d before the fruit mature , fruit setting rate of the two tree species were significantly decline with the rise of NAA and GA in the 10 ×10 -6 ~50 ×10 -6 test range , but 30 ×10 -6 ~50 ×10 -6 were the most significant , fruit abscission rate of these species were below 10%, were 88.4%lower than control .%在花楸树盛花期喷50×10-6赤霉素，可提高坐果率28．72％；喷PBO生长调节剂300倍液，可提高坐果率17．35％。在天目琼花盛花期喷50×10-6赤霉素，可提高坐果率22．71％；喷PBO生长调节剂300倍液，可提高坐果率14．93％。以山杏、山梨为研究对象，在果实成熟前25 d全株喷洒激素，在10×10-6～50×10-6范围内，随NAA和GA的增高，两个树种落果率明显下降，但均以30×10-6～50×10-6最为显著，落果率仅在10％以下，比对照下降了88．4％。
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