| In order to formulate reasonable improvement measures for saline\|alkali soil and improve cotton yield and water use efficiency, two drip irrigation methods were set up: unaerated conventional drip irrigation (A0) and aerated drip irrigation (A1), and four biochar application rates: 0, 12, 24, and 36 t·hm-2 (B0, B12, B24, and B36). The effects of aerated drip irrigation and biochar on the physical and chemical properties of saline\|alkali soil and cotton yield were studied. The results showed that with the increase of biochar dosage, the soil bulk density decreased gradually, which was 8.63% lower than that of the B0 treatment. The soil porosity, pH value, and salt content increased gradually, with an increase of 12.57%, 2.62%, and 11.72%, respectively. The soil water content increased first and then decreased, and the increase of the B24 treatment was the largest, reaching 19.24%. Compared with the A0 treatment, the soil bulk density, water content, pH value, and salt content of the A1 treatment decreased by 4.71%, 9.27%, 0.82%, and 4.65%, respectively, and the soil porosity increased by 6.19% on average. Under the combined action of aerated drip irrigation and biochar, the cotton yield increased by 17.17% on average, and the water use efficiency increased by 13.55% on average. |