Abstract: A new singlealiquot regenerativedose protocol is used to estimate the equivalent dose(De) in polymineral fine grains extracted from Holocene loess in Guanzhong, Shaanxi, in which three signals, bluestimulated,postIR blue stimulated and IR stimulated luminescence, are measured. In this approach,each natural or regenerated dose OSL is corrected for changes in sensitivity using the OSL response to a constant test dose(10%～20% of De). Among these three luminescence signals, postIR blue stimulated luminescence provides reliable estimates of De. It is concluded that priorIR exposure may dispel the trapped electrons with lower energy, and postIR blue simulated luminescence is mainly generated by the trapped electrons with higher energy.