Abstract: To solve the problem of guest soil resources for ecological restoration of a gold mine in the arid grassland region of Northwest,a study was conducted on using physicochemical modified materials prepared from raw materials such as corn straw,cow and sheep manure,and biological agents to improve the soil of the dump waste rock in the gold mine,replacing the surface soil resources for ecological restoration.By analyzing the changes in physicochemical properties and plant growth indicators of waste rock powder  with different modification ratios,the feasibility of soil modification of solid waste of a gold mine was verified.The results showed that:①adding physicochemical modified materials to improve the waste rock powder  can effectively adjust the alkaline properties of the waste rock powder to neutral,reduce the density of the waste rock powder to meet conventional soil requirements,and effectively improve the water retention capacity of the waste rock powder;②physicochemical modified materials can effectively increase the nutrients needed for plant growth in the waste rock powder,making the waste rock powder after soil modification meet the basic conditions for vegetation growth;③combining indicators such as germination rate,plant height,root and stem length,and plant growth of ryegrass,it was determined that the addition of 15 %of physicochemical modified materials is suitable for soil modification of waste rock powder.