本研究以山楂幼树做试材，通过环剥、去叶、去花、喷布赤霉素及尿素＋ＫＨ２ＰＯ４的处理方法研究了源库关系与坐果及幼果重的关系。结果表明：盛长期环剥有利于坐果，，减弱库间的竞争能力或增强库的调运养分能力，有助于坐果；而减弱源的物质供应，则会严重降低坐果率。因此认为，源库关系关系到坐果及幼果发育。 In this study, hawthorn seedlings were used as test materials to study the relationship between source and sink and fruit set and young fruit weight by girdling, removing leaves, removing flowers, spraying gibberellic acid and urea + KH2PO4. The results showed that: the long-term girdling is conducive to fruit set, reducing the competitiveness of the library or enhance the ability of the library to carry nutrients, is conducive to fruit set; and reduce the source of material supply, it will seriously reduce the rate of fruit set. Therefore, that the relationship between source and sink fruit and fruit development.