Abstract: The inbred SD rats with normal estrogenic cycle were made to swim.When their estrogenic cycles were restrained, two ovaries were ectomized, fixed by formalin, imbedded with paraffin,and siained by HE.We studied the changes of growth of follicle and development of corpus luteum.The result showed whose estrogenic cycle were restrained,the percentage of newly formed corpus lutuem to the total number was lower than those with normal estrogenic cycles (P<0.05),while the percentage of graffin follicles to total follicles was approximatedly the same(P>0.05).It is indicated that swimming had no obvious effect on development of follicle.A decline of the numbers of corpus lutuem suggest that the function of ovulation was inhibited.

Key words: rat, estrogenic cycle restrained, ovary