Abstract: The ultrastructure of organella of Hexamita wuchangensis Li Nie, 1995 is observed. Some microtubules are disperes beneath the recurrent flagellar complexes, but majority of them are surrounding the border of cytoplasm. The outside of the rough endoplasmic reticulum with developmental microtubules is notable. There is a cytopharynx and a pelta both in middle of kinetosomes and nuclei, and a lot of digestive vacuoles, but the mitochondrium, the golgi apparatus within the cytoplasm and the microtubular structure in subpellicle are not present. In addition the structure and the function of rough endoplasmic reticulum and identification of species of the organism are also discussed.