Abstract: The dissection and oberservation of external appearance and six main systems such as respiratory, digestive, circulatory, excretory, reproductive and nervous system of Zacco platypus has been carried out carefully by naked eyes and dissecting microscope in this paper.Through all the work, it has been learned about that the swim bladder, intestine, kidney, and gonad are relatively primitive, and that its unusual shaped pharyngeal process and horny plate as well as distinctly visible diencephalon are rare am...