Abstract: Electron paramagnetic resonmnce(EPR)spectrum won induced to decipher the paleoclimatic change information in the mollusk shells from the Luoe huan and Xifeng sections in the Loess Plateau．centra1 China The EPR analysis results showed the presence of trace amount of Mn2+ in the mollusk shells carbohate and no obvious tribal discrepancy of the EPR spectrum in tensities among different species of modern mollusks. The EPR intensities of the mollusk shells from the loess are significantly different from those in the paleosols The EPR signals of Mn2+ in the mollusk shells from the loess, which were formed under cold oonditions, are stronger than those from the paleosols which were developed under warmer conditions．Therefore，the Mn2+ content in the mollusk shells from the loess is higher than that from the paleosols It is concluded that during the glacial period, mollusks lived in more reducing environment．0n the contrary， during the interglacial period．the environment won more oxidizing. Thus the content of Mn2+ in the mollusk shells reflects the redox oonditions of the environment. The EPR signals of Mn2+ in the mollusk shells from loess and paleosols provide a new approach to reveal important information of environment changes.