Phosphorus release character from the sediment of Dajingshan Reservoir during the transition from anoxic to aerobic condition was studied by simulation experiments. Phosphorus was released from the two types of sediments collected from the dam area and the centre of the Dajinshan reservoir during the period of the study. Phosphorus release rate at the dam area is faster than that of the centre of the reservoir. Release rates for both the total phosphorus and the total dissolved phosphorus increased at first and then decreased slowly then get to the peak two weeks later. Release rate of the dam area for both total phosphorus and total dissolved phosphorus reached the maximum of 6.64 mg·m-2·d-1 and 1.37 mg·m-2·d-1,respectively. And for the sediment from the center of the reservoir were 3.24 mg·m-2·d-1 and 0.62 mg·m-2·d-1,respectively. The redox potential and pH for the overlying water in the simulation experiments showed a decreasing trend,which are two important factors affecting phosphorus release rate.
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