一选　即选择良种。应选择适宜当地小气候的特色良种 ,结合果隐性市场分析 ,本着“良种化、区域化、规模化、商品化”的改换原则 ,注重生态效益与经济效益 ,当前利益与长远利益相结合。二鉴　即鉴别亲和力大小。要从生产实践中总结不同砧穗之间是否亲和 ,亲和程度如何 ,并运 Choose a good one. Should select the appropriate characteristics of the local microclimate varieties, with Mangliee recessive market analysis, based on “good variety, regionalization, large-scale, commercialization,” the principle of change, pay attention to ecological and economic benefits, the current interest and the long-term interests of the combination . Two Kam is the identification of affinity size. It is necessary to conclude from the production practice whether different rootstocks are compatible and affinity,