Abstract: The fine structures of 10 cysts and the tegument surface of protoscolices of E. gra-nulosus from human lungs and livers were observed by means of transmission(TEM) and scanning electron microscopy(SEM). Examined by TEM, the laminated layer is made up of microfibrillate matrix with aggregates of electron-dense materials (Fig. 1). The germinal layer contains microtriches, tegument and tegumental cells, etc. Larger vesicles found near the inner margin of the cysts (Fig. 3)are presumably young brood capsules. Irregular electron-dense granules adhere to the vesicles and the inner membrane. The structure is similar to myelin sheath which lies in germinal layers (Fig. 4). By using SEM, most of the protoscolices appear invaginated. They are characterized by a smooth contour without microtriches. No orifice is visualized at the anterior end where the apical portion is invaginated (Fig. 6, 7). The posterior end is pedundle-like.Generally, the tegument surface of the eyaginated protoscolices could be divided into four regions: the rostellum region with hooks and long, slender, filamentous microtriches; the mid portion containing four suckers and blade-like microtriches; in the rear part, tegumental indentations forming longitudinal, transverse and irregular furrows, the tegument surface bearing many small cylindrical projections which might be the undeveloped microtriches; the peduncle region resembling that of invaginated protoscolices (Figs. 8-10).