Abstract: The ovulation induction(OI) and timed intercourse was the most simple and common assisted reproductive procedure for those infertile outpatients. Recent publications on this topic, combined with our clinical experiences, were reviewed, which is benefit to improve clinical practice for doctors of reproductive medicine. The following fileds were focused in this review: examination，valuation and preparation before OI, indication and contraindication of OI, the mechanisms and usage of common OI drugs, guidance of timed intercourse, as well as treatments of complications. Some important aspects were emphasized: to rule out the contraindications of pregnancy and OI before OI, to know well the mechanisms of common OI drugs and their dosages and administrations, to evaluate follicular growth and to predict ovulation time by means of various methods, and to prevent and treat timely OI complications.

Key words: Ovulation induction, Ovulation prediction, Reproductive techniques, assisted, Clomiphene, Chorionic gonadotropin