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为了克服大扁杏生产上原始品种存在的品质差、丰产性能低的现状，在辽宁大扁杏产区内，按选优的标准，采用“周围３株大树产量对比法”，经初选、复选和决选，选出１７株大扁杏（龙王帽）优良单株。产量比对照树增加２５％以上，在生产上应用，可大幅度地提高产量和效益。
In order to overcome the poor quality and low yield performance of the original cultivars in the production of the big flat apricots, Liaoning Province, according to the selection criteria, the “comparison method of the output of the three big trees around” , Check and decide the election, elected 17 Daping apricot (Dragon King hat) excellent single plant. Output increased 25% more than the control tree, applied in production, can greatly improve the yield and efficiency.