Rheological behavior of a silicon containing arylacetylene resin( PSA) is very important for RTM
molding. The curing properties and relationship between viscosity of the resin and time were studied with DSC analysis and viscometer measurements respectively. The results shows that PSA resin is a typical Newton fluid and has a low viscosity platform from 100益to 130益. A Dual Arrhenius viscosity model has been established to describe the rela tionship among viscosity, temperature and time. The estimated viscosity values of the established model are in good a greement with the experimental ones. This equation of the model can be used as a guide for the RTM molding of PSA.