To study the effects of XW630 on bone formation in overiectomized（OVX） rats and in human osteoblast like cell line TE85. [WT5”BX]Method.[WT5”BZ] Bone histomorphometric analysis was performed with undecalcified bone sections and tetracycline intraperitoneally labeling. [WT5”BX]Results.[WT5”BZ] Compared with that of OVX rats

the static data of trabecular bone volume（TBV）/ total tissue volume（TTV）

TBV/sponge bone volume（SBV） and mean trabecular plate density （MTPD） were enhanced while mean trabecular plate spacing（MTPS） decreased after treated with XW630 for 13w. The dynamic data of single labeled surface [Sfract（s）]

double labeled surface[Sfract（d）]

Sfract（d+1/2s）

trabecular osteoid surface（TOS）

and bone formation rate in tissue level （Svf） were increased and osteoid maturation period （OMP） shortened in XW630 group. In osteoblast like cells

both 3H thymidine incorporation and cell count increased after treated with XW630 for 48. Treated with XW630 for 12～18h

inducible nitric oxide synthase（iNOS） activity and cGMP content increased in time dependent manners. [WT5”BX]Conclusions.[WT5”BZ] XW630 enhanced bone activation frequency and increased trabecular connectivity

stability

and strength. The cellular mechanism related to effects of XW630 on bone formation in ovariectomized rats.