Abstract: The vegetable production in Bashang cold and arid region is facing the problem of low water use efficiency caused by extensive irrigation management. It is urgent to build a high-yield, high-quality and water-saving collaborative precision irrigation mode. In this study, the Chinese cabbage in this area was taken as the research object, and different irrigation thresholds were set at seedling stage, rosette stage and heading stage: W1 (80% -95% field capacity FC, 80% -95% FC, 80% -90% FC), W2 (80% -90% FC, 70% -90% FC, 70% -85% FC) and W3 (80% -100% FC, 60% -100% FC, 60% -100% FC), to explore the effects of soil water threshold regulation of drip irrigation under film on crop water consumption, yield and quality. The results showed that compared with W3, which had the highest irrigation amount, W2 reduced irrigation amount and evapotranspiration by 36% and 18%, respectively, while there was no significant decrease in the yield of hairy and clean vegetables; The irrigation and evapotranspiration of W1 decreased by 39.8 mm and 25.3 mm, respectively, resulting in a 10% decrease in yield. Compared with the three irrigation schemes, the water use efficiency of W2 increased by 21% and 18% respectively compared to W1 and W3, and the irrigation water use efficiency increased by 41% and 53% respectively compared to W1 and W3. Moreover, W2 had the best quality (nitrate content 1422.65 mg·kg^-1, vitamin C 25.05 mg·100g^-1). Overall, the W2 mode can meet the soil moisture requirements of different growth stages of Chinese cabbage, which is consistent with the water demand pattern of crops and balances water conservation, efficiency, and quality improvement. The results of this study provide important theoretical basis and technical support for the construction of an efficient and water-saving production system for Chinese cabbage in the Bashang Plateau of cold and arid regions.