This study was carried out to investigate the effects of the Cirsium japonicum var. ussuriense (C. japonicum)extract on serum level of hormones from induced osteoporosis by ovariectomized rats. Two month-old rats were ovariecto-mized (OVX), remained untreated for 8 weeks, and were subsequently administered C. japonicum (200㎎/㎏) every day for8 weeks. We examined the effects of treated C. japonicum on ovariectomy-related changes in Insulin-like Growth Factors(IGF), Insulin-like Growth Factor binding protein-3 (IGBF-3), Estrogen, Calcium, and Phosporus. After 8 weeks, the serumlevels of IGF-I, -II, and IGFBP-3 were higher presented as compared to the other two groups (P<0.05), in the C. japonicumextract treatment on OVX rats. There were differences between OVX and C. japonicum extract treated OVX rats in serumlevels of Ca2+, but Ca2+ levels for the normal group was higher than for the other two groups. The C. japonicum extractincreased both serum IGFs and IGFBP-3 levels on induced osteoporotic rat by ovariectomized. Thus, these results revealedthat the C. japonicum extract is a possible role for improvement of osteoporosis induced-ovariectomized rats and has a greatpotential as an alternative tool for the treatment of osteoporosis.