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The total and partial charge-changing cross sections of 28Si on carbon targets at 736 and 723A MeV are studied by CR-39 plastic nuclear track detectors using the HSP-1000 microscope system and the PitFit track measurement software.The values of the total charge-changing cross section are σtot =(1179 ± 50) mb and σtot =(1186 ± 42) mb at 736 and 723A MeV,respectively.The result is compared with the ones obtained by other experimental and theoretical results.The odd-even effect of the partial charge-changing cross section is observed.