Phosphorus is one of the important limited elements to lake eutrophication.The regeneration of phosphorus from sediment may be an important phosphorus resource for lakes.Several undisturbed sediment cores have been sampled at the deepest area of a canyon-reservoir, Lake Hongfeng, on Guizhou Plateau, southwestern China.The concentration and distributions of various phosphorus forms in sediment cores have been studied.The chronology data have been obtained by means of ²¹⁰Pb, 13_Cs for the same sediment cores.The geochemical processes of various forms of sedimental phosphorus were mainly controlled by early diagenesis and anthrogenic disturbances on the phosphorus burial in sediment.In our study, the SEDEX method from Ruttenberg has been used to identify the various forms of phosphorus in sediment samples.The species of phosphorus include: loosely sorbed P, Fe-bound P, Ca-bound P, detrial-P and Organic-P.The results showed that the organic-P and Fe-bound P could been seen as two main sorts phosphorus in sediment of Lake Hongfeng, about 60% and 28% in total sediment phosphorus respectively.The forms and vertical distrubition profiles of sediment phosphorus implied that the sediment phosphorus could have strong ability of regeneration during the terminal burial in the bottom of Lake Hongfeng.Under certain conditions, the sediment of Lake Hongfeng could be regarded as the important resource of phosphorus for lake system rather than a sink.