Abstract: Soil salinization was a global problem,which not only seriously affected agricultural production,and also greatly threatened landscape and urban planning projects. In present study,different landscape combinations and fertility measures were used to investigate the adjustable mechanism of the vegetation coverage to the urban green belt saline-alkali soil in the Lanzhou New District. The results showed that“Aesculus chinensis Bunge + Catalpa bungei C. + Rosa rugosa Thunb.”landscape combination Ⅱ,treated with organic fertilizer and microbial inoculants,the average vegetation coverage reached to 70.06% during a growth season. And the topsoil desalination rate could reach to 53.51%,while the "bare land" was only 20.62% and5.46% respectively. The pH value and electrical conductivity of the landscape combination Ⅱ decreased by12.54% and 63.83%,respectively,while the“bare land”only decreased by 3.14% and 12.28%. Correlation analysis（P＜0.05）shown that vegetation coverage was highly negatively correlated with soil salinity（r=-0.949）,but highly positively correlated with soil organic matter（r=0.887）and with total nitrogen（r=0.853）respectively. These results indicated that can effectively improve the salt content of saline-alkali soil in the Lanzhou New District,by increasing the vegetation coverage of the green belt and improving soil fertility.