Abstract: The aim of the study was to observe the ultrastructure of Cysticercus pisiformis under different state. The Cysticercus pisifomis were obtained in the procedure of slaughter inspection from meatpacking plant. The Cysticercus pisiformis was taken out by cutting cyst directly, or cultured with physiologic saline containing 10% bile until evagination. Then it was observed and recorded by scanning electron microscopy. Observed from top of scolex of Cysticercus pisiformis locate in cyst，the rostellum looked like a umbrella. The cutaneous muscular columns with hamula covered the front end of scolex. Viewed from the side, a row of antlersliking hamula adhered to the scolex. Four suckers were looked like cavity and distributed around the scolex behind the rostellum. Primary neck segments were more width and body segments less fine，in which there were lots of wrinkles in their surface respectively. The Cysticercus pisiformis cultured was divided obviously into scolex, neck, body segment and zone of cyst. When cutaneous muscular column of rostellum contracted, the antlerliking hamula extended to periphery, and the sucker also had ringlike and vertical shape contraction. It was also found evidently that the ringliking contraction appeared in neck and the lengthways contraction in body segments. The Cysticercus pisiformis under different state has distinctly dissimilar ultrastructure.