近年来各国医药界在口服避孕药的寻找方面进行了大量的研究工作,取得了一定的成果。在理论上,利用内服药物对受孕过程中任何一个环节加以阻断,均能达到节育的目的,可是实际上存在着很多困难。受孕过程大致可分为(1) In recent years, the pharmaceutical industry in various countries in the search for oral contraceptives conducted a lot of research work, and achieved some results. In theory, the use of oral drugs to intercept any one part of the process to be blocked, can achieve the purpose of birth control, but in fact there are many difficulties. Pregnancy process can be broadly divided into (1)