The antigen location of Schistosoma japonicum, Clonorchis sinensis and Paragonimus westermani were studied by using immunogold-silver staining(IGSS) and indirect fluorescent antibody test(IFAT). The results showed that the specific antigen of S.japoniaum was located in its gut wall and tegument, and those of Clonorchis sinensis and Paragonimus westermani in their gut wall. The specific antigen component in seminal vesicle of Clonorhis sinensis is also observed with IGSS. There is specific antigen in tte tegument of Paragonimus westermani too.