Slow follicular growth in IVF suggests poor ovarian responsiveness, which will increase the dose of ovulation stimulating drugs and lead to fewer mature follicles, resulting in a corresponding decrease in the number of embryos available for transfer, which may reduce the IVF success rate. If the follicles grow slowly after the use of ovulation stimulating drugs when doing IVF, it suggests that the ovaries react poorly and the eggs are of poor quality. Under normal circumstances, a woman with normal ovarian function should have normal follicles that mature on time without the use of drugs. If the follicles grow slowly and do not mature normally with the use of drugs in IVF, it means that there are factors affecting follicular growth, which will affect the quality of the eggs. It is necessary to actively find out the reasons for poor follicular growth, and promptly adjust the program of IVF ovulation to promote follicular growth and maturation, to reduce the impact on the number of eggs retrieved, the number of mature eggs, and the number of embryos matched into transferable embryos, so as not to reduce the success rate of IVF.