In this study the process of spermatogenesis of Fasciolopsis buski has been observed by using the air-drying method.The results show that F. buski has the same process of spermatogenesis as that of the other digeneans. After 3 times of mitotic divisions as well as first and second meiotic divisions the spermid atage(32-cell stage) is formed through the process of the primary spermatogonial stage (1-cell stage)

secondary and tertiary spermatogonia (2 - and 4-cell stages)

primary and secondary spermatocytes (8 - and 16-cell stages). The spermatid then matures into 32 spermatozoa.The metaphase of spermatogonia has 14 chromosomes

which appear as "X" and "-" shapes

the metaphase I has 7 bivalent chromosomes

which form 7co-shaped con-figurations

while the metaphase II has 7 haploid chromosomes

which appear as "X" and"-" shapes

Therfore

they can be differentiated easily.Compared our results with that of Liao et al (1987)

there are some differences in the descriptions of chromosomes of the metaphase I and II of meiosis

and of the metaphase of spermatogonia. The reason may be that Liao et al (1987) did not differentiate the metaphase I and II of meiosis