Billings自然生育调节法是目前世界卫生组织提倡使用的，选择避孕的方法之一[1]。这是一种不用药物、不用工具，只要掌握宫颈粘液变化规律就能控制生育的自然方法[2]。我所1997年1月～1998年4月对产后哺乳期143对夫妇进行Billings自然生育调节法指导，并随访观察产后12个月，避 Billings natural birth control method is currently advocated by the World Health Organization to choose one of the methods of contraception [1]. This is a non-drug, no tools, as long as the change of cervical mucus can control the birth of natural methods [2]. From January 1997 to April 1998, we performed the Billings natural birth control method for 143 couples during postpartum lactation period and observed 12 months postpartum to avoid