Abstract: The dynamic mechanical properties of CPVC/GF composites were investigated by using Viscoelastic Analyzer.The corrosion resistance behavior of the composites in water and dilute acid,alkali,salt solution was studied by referring to the pertinent experimental standards.The surface microstructure of the samples corroded was detected by SEM.The results show that the CPVC/GF composite is a kind of excellent materials with corrosion resistance below 70℃ and the mechanism of corrosion may be the coordinated action of physical permeation and chemical reaction.As a result,it will be favorable for compounding, processing and utilizing of this CPVC composite.