The present paper deals with a study on redoxic features of calcareous purple soils after waterlogging through a simulated incubation test. The results show that (1)as compared with haplie purple soils and dystric purple soils, calcareous purple soils were difficult to develop strong reduction status, which was related to the contents of CaCO₃ and active iron of soils (2) the different organic substances had different influences on soil reduction intensity and (3) the intensity factor (redox potential) was highly correlated with the amount factor (content of reducing materials) and was consistent with the growth status of rice. When Eh<-100mV and the total amount of reducing substances>3.63cmol/kg, soils were easy to develop strong reduction ststus, which would poison the rice growine.