自80年代中后期开始引进耐热大白菜材料或品种以来，我国夏季大白菜生产迅猛发展，耐热大白菜已成为夏秋高温季节的一种重要叶菜。由于耐热大白菜种株生长发育特性及产量构成与秋大白菜有较大区别，按目前常规的留种方法，一方面大株材料难以收到种子，另一方面生产用种产量难 Since the introduction of heat-tolerant Chinese cabbage materials or varieties in the mid and late 1980s, summer cabbage production has been developing rapidly in China. Heat-resistant Chinese cabbage has become an important leaf-vegetable in summer and autumn in high-temperature season. As the heat-tolerant Chinese cabbage growth and development characteristics and yield composition and autumn cabbage are quite different, according to the current conventional method of retention, on the one hand it is difficult to receive large plant material seeds, on the other hand the production of seed production is difficult