Abstract: To verify the hypothesis that the forms of bioactive phosphorus are influenced by oxygen-consumed organic matters, sediments were exposed to oxygen-consumed organic matters for 30 days by replacing oxygenconsumed organic matters with glucose. The results showed that: if there was no air inflation, the Ex-P content in surface sediment exposed to glucose with concentration 0, 2, 4 and 8 mg/L was 0.02±0.01, 0.02±0.01, 0.03± 0.01 and 0.02±0.01 μmol/g; under air inflation, the Ex-P content in surface sediment exposed to glucose with concentration 0, 2, 4 and 8 mg/L was 0.03±0.00, 0.03±0.01, 0.03±0.01 and 0.06±0.02 μmol/g, and the Ex-P content of sediment exposed to glucose with concentration 8 mg/L was higher than that in sediment exposed to glucose with concentration 0 mg/L (P<5%); moreover, the IP content in surface sediment exposed to glucose with concentration 0, 2, 4 and 8 mg/L was 0.96±0.42, 0.74±0.29, 0.97±0.78 and 0.88±0.22 μmol/g if there was no air inflation; nevertheless, the IP content in surface sediment exposed to glucose with concentration 0, 2, 4 and 8 mg/L was 0.37±0.10, 0.46±0.16, 0.41±0.06 and 0.69±0.05 μmol/g, and the IP content of sediment exposed to glucose with concentration 8 mg/L was higher than that in sediment exposed to glucose with concentration 0 mg/L (P<5%). There is a double threshold effect of oxygen-consumed organic matters on bioactive phosphorus in sediments.