Abstract: 【Abstract】 Objective To observe the growth and development of Echinococcus multilocularis metacestodes under in vitro cultivation. Methods Hepatoma cell line was used for the cultivation. The number and morphology of the cysts were observed under light microscope. The parasite tissue was fixed and observed under electron microscope. Results During the first 21 days of cultivation, metacestodes in cyst-suspension derived cultures increased dramatically, and from the 22nd day on, the number of cysts remained as 6－7 times more than that of the 3rd－4th day of culture. Budding of new cysts was observed and the diameter of the cysts increased as time went on. On the 22nd day, larger cysts occupied 30%. Cysts were found with morphology between protoscolex and metacestode.　 Conclusion 　An in vitro cultivation for the cysts of E. multilocularis has been established and basic feature of growth and development of the larvae observed.

Key words: Echinococcus multilocularis, In vitro culture, Cyst