Abstract: This paper focuses on the phosphate immobilization and its inhibition as well as fertiphos requirement of the soil under oak stand.The main results show that the immobilization of the soil is so strong that a large of phosphorus is immobilized and the immobilization ratio is high.Humic acid has an effect of inhibition on phosphate immobilization to a certain extent,and it can increase the fertiphos utilization efficiency.Results also show that the fertiphos requirement of the soil can be predicted according to the property of phosphorus immobilization,and it,therefore,is important for rational application of fertiphos.