A study on the function of the Laurer's canal of Clonorchis sinensis was conducted with help of the light microscope, the transmission electron microscope, and the scanning electron microscope. Some selected sexual organs concerning with the passages of the spermatozoa and the eggs were obseved in detail. The conclusion of this study is that the Laurer's canal may be the copulatory organ of the female reproductive system as Miyazaki et al. suggested in case of lung flukes.
