A spring wheat filed experiment was conducted to investigate the effects of conservation tillage on soil wind erosion and soil physical properties by analyzing the changes of field sediment discharge, soil aggregate composition, <0.01mm physical clays, <0.01mm dispersible clays, and dispersion coefficient with increasing year in Minqin oasis irrigational area. Four kinds of conservation tillage were adopted in this study, 1) no-tillage with no stubble (NT), 2) no-tillage with stubble (NTS), 3) standing stubble (SS), and 4) stubble overwhelm (SO), while conventional tillage (CT) as control. The results showed that compared with CT, conservation tillage treatments decreased significantly sediment discharge, the quantity of >1mm soil aggregates as impossible wind erosion particles changed insignificantly, macro-aggregates (>0.25mm) increased, and micro-aggregates (0.25–0.05mm) decreased. In the second year of the test, <0.05mm soil particles were all decreased significantly in other conservation tillage treatments except no significant decrease in SS treatment. In the third year of the test, <0.01mm physical clays decreased in CT compared with all conservation tillage treatments, <0.01mm dispersible clays decreased significantly with increasing year under NT, SS and SO treatments, while no significant change under NTS treatment, soil dispersion coefficient decreased significantly with increasing year under NT and SO treatments, while no significant decrease under NTS and SS treatments. In the third year of the test, dispersion coefficient decreased in all conservation tillage treatments, sediment discharge had extremely significant negative correlation with >1mm soil aggregates, <0.05mm soil particles and <0.01mm dispersible clays, extremely significant positive correlation with 0.25–0.05mm soil aggregates, but no significant correlation with 1–0.25mm soil aggregates, <0.01mm physical clays, and dispersion coefficient. In conclusion, in the study area, conservation tillage can reduce soil wind erosion, improve soil microstructure gradually, which is beneficial to formation of soil macro-aggregate, but this is a slow process, cannot influence soil wind erosion obviously in three years.