Bisphenol E cyanate ester (BEDCy) was blended with silicone-containing arylacetylene resin (PSA) to prepare a blended resin (BEDCy/PSA) via solution mixing and evaporation process. The curing reaction of the BEDCy/PSA was studied by DSC and in situ infrared monitoring, the heat resistance of the cured blended resins was characterized by TGA and DMA. The dielectric and mechanical properties of the cured blended resins were further evaluated. The results show that PSA can catalyze the curing reaction of BEDCy. With the addition of PSA resin, the temperature of 5% weight loss and residual yield at 800℃ of the cured blended resins under nitrogen and air atmospheres are higher than 450℃, 80% and 19%, respectively. The dielectric constant and dielectric loss of the cured BEDCy resin decreases upon addition of PSA resin.