Organosilicon-containing soil conditioner is a new type of fertilizer，which has the function of improving saline alkali soil and promoting crop growth.It is of great significance for the popularizing of new fertilizers to study the effects of this new type of fertilizer on physical and chemical properties of saline alkali soil and biological properties of crops.Field experiments with 13 plots were carried out on 6 main crops of different types of typical saline alkali soil in 11 counties involving 6 provinces of China from 2018 to 2019.In these plot experiments，the effects of organosilicon-containing soil conditioner on physical and chemical properties of saline alkali soil，biological properties of crops and yields were studied.The results showed that compared with the background values，the application of organosilicon-containing soil conditioner reduced the bulk density of the plough layer by 3.17%～28.40%，the total amount of water-soluble salt in the plough layer by 4.32%～80.00%，and the pH of the plough layer by 0.10～1.32.Compared with the common compound fertilizer，the application of organosilicon-containing soil conditioner increased the plant height，grain number per ear，1000 grain weight of rice and corn，plant height，stem diameter，disk diameter，100 grain weight of sunflower，single root weight of beet and single melon weight of honeydew melon.The application of organosilicon-containing soil conditioner also significantly increased the yields of rice by 2.97%～30.63%，the yields of corn by 4.09%～6.77%，the yields of sunflower by 4.60%～14.21%，the yields of melon by 2.91%～11.11%，the yields of apple by 8.89%～10.85%，and the yields of beet by 3.55%～7.75%.All the results showed that the application of organosilicon-containing soil conditioner can improve the physical and chemical properties of saline alkali soil，improve the biological properties of crops，and increase the yield，which is a new technology for the treatment of saline alkali soil.