The lifting efficiency of traditional air-lift system is low，therefore a jet air-lift of annular jet pump structure is designed in this article，and an experimental device of air-lift system is established.In the experiment，riversand is chosen as the lifting object，and the influence laws of jet air-lift lifting water and solid capacity by air flow rate on submergence ration are researched.The flow pattern inside the riser is analyzed，and the lifting solid capacity of traditional air-lift and jet air-lift is compared.The efficiency model of air-lift is established by energy conservation law，and the lifting solid efficiency of traditional air-lift and jet air-lift is compared.The result show that there is a best air flow rate making the highest of water and solid flow rate.The water and solid flow rate increase as the submergence ration increases，and the system can lift water and solid effectively when the flow pattern is churn flow.The lifting solid efficiency of jet air-lift is higher than that of traditional one，especially in the condition of high air flow rate and low submergence ration.