A 5years field trial was established in Yili area to investigate the effects of the biogas slurry on soil quality in oasis farmland.The control group was treated by chemical fertilizer and the experimental groups were treated by biogas slurry.The results showed that application of biogas slurry to the same soil for 5 years was helpful for adjusting soil pH of intensive vegetable field,and improved soil alkaline soil of intensive vegetable field.Moreover,application of biogas slurry to the same soil for 5 years could also enhance soil fertility of the oasis farmland,particularly the contents of the essential nutrients required for plant growth in soil depth of 20 cm,such as soil organic matter,total N,total P,available N,available P,available K,total Ca,total Fe,total Zn and total Cu.However,application of biogas slurry to the same soil for 5 years could lead to electrical conductivity increase significantly in soil depth of 20 cm,and the heavy metals were accumulated remarkably in the topsoil of oasis farmland.At the end of 5 years field trial,no soil secondary salinization was detected in the soil of oasis farmland,and the concentrations of soil heavy metals were lower than the criteria of National Soil Quality Standards.With the biogas slurry irrigation duration prolonged,there were potential risk of soil secondary salinization and soil heavy metals exceeding,especially Cd,As and Ni of the soil.