This paper deals with activation kinetics of accmulat ive phosphorus in fluvoaquic soils and red soils, as is influenced by organic matter.Four kinetic equations can well describe the activation of accumulative phosphorus.Removing organic matter with H₂O₂ accelerated act ivat ion of the accumulative phosphorus in fluvoaquic soils, but had no significant influence on red soils.Incubation with addition of 2% glucose promoted activation of the accumulative phosphorus in red soils, but did little in fluvoaquic soils.