By the use of polarized light microscopy, chemical etching and scanning electron micro-scopy, the erystalline morphologies of polyphenylene sulfide (PPS) have been studied. Thecrystalline morphologies of PPS are greatly affected by the curing conditions. Either gra-phite fibres and carbon fibres, or glass fibres, possess the ability of inducing the transcry-stallization of PPS at different degrees. The corrosive resistance of PPS resin is not onlyrelated with its chemical structure, but also with its aggregation structure, and furthermorewith the “interface effects” of carbon fibres in the composites. By the use of polarized light microscopy, chemical etching and scanning electron micro-scopy, the eorphorphologies of polyphenylene sulfide (PPS) have been studied. The crystalline morphologies of PPS are greatly affected by the curing conditions. Either gra-phite fibers and carbon fibers , or glass fibers, possess the ability of inducing the transcry-stallization of PPS at different degrees. The corrosive resistance of PPS resin is not only associated with its chemical structure but also with its aggregation structure, and with the “interface effects” of carbon fibers in the composites.