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北京小杂５６号’早熟大白菜是北京市蔬菜研究中心用双１和２６９两个自交不亲和系配制而成的优良一代杂种，经中心内多年的品种比较试验，三年的北京市区域试验、生产示范及两年的全国区域试验、生产试验，１９８８年春正式通过鉴定。该品种植株整齐一致，株高４０—５０厘米，开展度约６０厘米，外叶绿，心叶黄，叶球褶抱、舒心，单株净重２公斤左右，品质中上，具有早熟（生长期５０—６０天）、耐热、耐病、适应性广的特点，可在春秋两季进行栽培。除适宜北京及河北地区外还适于全国大多数地区种植及消费习惯，１９８６—１９８８年已推广到全国２３个省、自治区，累计面积为５万多亩，与各地地方品种相比，增产幅度为２０－５０％，增值２５－５０％。
Beijing hybrid 56 is a precocious cabbage is Beijing Vegetable Research Center with double 1 and 269 two self-incompatibility between the preparation of good hybrids, the center for many years of comparative trials, three years of Beijing Regional testing, production demonstration and two-year national regional test, production test, the spring of 1988 formally passed the appraisal. The variety of plants neat, plant height 40-50 cm, the degree of about 60 cm, the outer leaves green, yellow heart leaves, leaf ball folds, comfortable, weight about 2 kg per plant, the quality of the medium, with precocious 50-60 days), heat-resistant, disease-resistant, wide adaptability, can be cultivated in spring and autumn. Except for Beijing and Hebei, it is also suitable for cultivation and consumption habits in most parts of China. From 1986 to 1988, it has been extended to 23 provinces and autonomous regions in the country with a total area of more than 50,000 mu. Compared with the local varieties, the yield increase 20-50%, value-added 25-50%.