Abstract: The non-isothermal crystallization process of poly(ethylene terephthalate)(PET) fiber was researched by the method of differential scanning calorimetry(DSC) and computer simulation.It was showed that the fitted error of activation energy obtained from the reformed Ozawa equation and computer simulation was 0.048.And the fitted error of nucleation parameter was 0.033.The fitted errors were both confined within 1%.The research indicates that the activation energy and nucleation parameter of PET by computer simulation can been obtained.