分娩能否顺利完成取决于产力、产道、胎儿和精神心理因素的相互协调 ,如果其中一个或几个因素发生异常就会影响产程的进展。头位分娩时顺产与难产的界限有时很难确定 ,须严密观察产程 ,才能及时发现难产倾向 ,因此在临床上使用一种科学而实用的监护方法监护产程是很有必要的 , The successful delivery depends on the coordination of labor, birth canal, fetus and mental and psychological factors, if one or more of these factors abnormalities will affect the progress of labor. Head childbirth birth and dystocia when the line is sometimes difficult to determine the boundaries, labor must be closely observed in order to timely detection of dystocia tendency, so the clinical use of a scientific and practical method of custody custody is necessary,