Abstract:A field experiment was conducted to study the improvement effect of soil quality in sloping red cultivated land by contour reverse-slope terrace. The small watershed of Yizhe in Songhua Dam in Kunming northern suburb of central Yunnan was selected as a research area in this study, the 3-years (CRT 3), 7-years (CRT 7), 9-years (CRT 9) samples in contour reverse-slope terrace and unaltered sloping farmland (CK) were used as the research objects, combined with corn yield in various samples, the effects of implementing years on soil structure, fertility and enzymes activities were investigated. The results showed that the soil physical properties of sloping farmland were significantly improved by the growing land preparation years of the contour reverse-slope terrace. It appeared that the soil clay, silt, total aggregate and total porosity increased significantly, while the sand content and bulk density decreased significantly. It increased soil fertility, among which the concentrations of total nitrogen, total phosphorus, total potassium, available phosphorus, available potassium and water content were significantly increased, and among which urease, amylase, sucrase, phosphatase, protease and catalase activities were increased by 24.25% ~ 117.43%, 20.90% ~ 82.82%, 17.09% ~ 99.69%, 30.15% ~ 82.63%, 32.21% ~ 66.50% and 11.67% ~ 41.39%, respectively. At the same time, corn yield was significantly increased, and CRT 9 had the most obvious effect, which increased by 22.47%. Land preparation measures of contour reverse-slope terrace could improve the soil environment of sloping farmland, and with the increases of land preparation years, soil quality would be better improved, effectively reduced land degradation.