Recovery of phosphorus (P) from wastewater is of great significance for alleviating the short-age of P resources.At present,the P recovery process is faced with the problem of excessive organic carbon consumption when obtaining a P-concentrated recovery solution.This study proposed a new strategy to obtain a more highly concentrated P recovery solution with min-imal carbon consumption by strengthening the P storage capacity of the biofilm.A biofilm sequencing batch reactor (BSBR) process was modified to treat synthetic wastewater.The effect of the dissolved oxygen (DO) concentration on the P storage capacity of the biofilm was investigated at DO concentrations of DO 3.5 mg/L (PL) and DO 6.5 mg/L (PH).The results showed a maximum P storage of 101.2 and 149.6 mg-P/g-mixed liquid suspended solids un-der the two conditions.Strengthening the P storage capacity of the biofilm resulted in a net increase in the P recovery rate,which was as high as 66.96％ in a harvesting cycle,and total soluble P＞220 mg/L in the P recovery solution was successfully achieved.Meanwhile,the carbon cost of P recovery in the BSBR was reduced to 41.57 g-chemical oxygen demand/g-P,and the carbon utilization efficiency was enhanced.To highlight the new strategy,the P recovery performance of the BSBR was given and the relationship between P content and anaerobic P release was discussed.In addition,the changes in the microbial communities under PL and PH conditions were analyzed.