Using Zhonggan2l as the experimental material, an experiment was conducted to study the effects of different film mulching periods and modes on yield and water use efficiency of dryland spring cabbage in mountainous region. The results showed that autumn whole mulching on double ridges significantly improved soil water content in 0 ~ 100 cm during transplanting stage and in 0 ~60 cm during heading stage, and promoted the growth cabbage. The yield and water use efficiency of cabbage under autumn whole mulching on double ridges was 41 000.00 kg·hm-2 and 210.61 kg·mm-1·hm-2 respectively, which was significantly increased by 14.42% ~ 89.23% and 20.67% ~ 88.58% compared with autumn whole mulching; Spring whole mulching on double ridges, spring whole mulching, autumn half mulching and spring half mulching. Therefore, autumn whole mulching on double ridges could improve the yield and water use efficiency of spring cabbage, and could be adopted as a major cultivation method of spring cabbage in dryland in mountainous region of Tianshui City.%以中甘21号甘蓝为试验材料,研究了覆膜时间及覆膜方式对山旱地春甘蓝产量和水分利用效率的影响.结果表明:秋季全膜双垄沟显著提高山旱地春甘蓝定植时0～100 cm土层内和结球期0～60 cm土层内的土壤含水量,促进了甘蓝的生长；秋季全膜双垄沟的产量和水分利用效率为41 000kg·hm-2和210.61 kg·mm-1·hm-2,较秋季全膜平铺、春季全膜双垄沟、春季全膜平铺、秋季半膜平铺、春季半膜平铺(CK)分别提高14.42％～89.23％和20.67％～88.58％,差异均达极显著水平；秋季全膜双垄沟显著提高了山旱地春甘蓝的产量和水分利用效率,可作为天水市山旱地春甘蓝的主要栽培方式.
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