The purpose of this research was to investigate the effect of calcium levels(50, 100 and 200% of requirement) on metabolism of Ca, Na and K in Young and adult female rats for 3 weeks. There was no significant difference in feed intake, body weight gain and feed efficiency ratio among the groups of different Ca intake level. Serum Na level of high-Ca group was significantly lower than that of low-Ca or normal-Ca group in Young rats. There was no significant difference in liver Ca and K contents among the groups of different Ca intake levels. But, Na content in liver was decreased by the increase of dietary Ca intake. Ca content in kidney of high-Ca group in young rats and normal-Ca group in adult rats were significantly higher than those of other groups. Na content in kidney of low-Ca group was lower than those of normal-Ca and high-Ca groups. Urinary excretions of Na and K and fecal excretion of Ca were increased by the increase of dietary Ca intake. But, fecal excretions of Na and K were not affected by dietary Ca intake. According to this study, it was found that the high Ca consumption promotes excretions of fecal Ca and urinary Na and K in rats. The study verifies the need for more study on the interrelationship among Ca, Na and K metabolism and bood pressure.