目的:了解孕妇孕前体重及孕期体重变化对产科并发症及妊娠结局的影响。方法:对孕足月、单活胎初产妇进行前瞻性调查研究,根据孕妇的孕前身高、体重计算其体重指数,记录其孕期体重增加数;分娩后,记录有无妊娠并发症以及分娩并发症。按孕前体重指数和孕期增重数分别将孕妇分组,并比较各组间产科并发症发生情况。结果:(1)妊娠期糖尿病发生率在孕期增重≥12 kg时较孕期增重<12 kg时高;(2)随着孕前体重的增加,妊娠期糖尿病、产程阻滞、妊娠期高血压疾病、巨大儿均增加;其中当孕期体重增加巨大儿和妊娠期高血压疾病均增加;(3)对孕前及整个孕期体重的控制可以减少妊娠期并发症及分娩并发症的发生率,并可以降低剖宫产率,改善母儿预后,对临床孕期保健有重要指导意义。(4)不同孕前体重有不同孕期增重的适宜范围,能减少产科并发症及不良妊娠结局的发生,最终产前体重控制在适当范围,可为妊娠期肥胖标准的确定提供科学依据。 OBJECTIVE: To understand the effect of pre-pregnancy weight and weight change during pregnancy on obstetric complications and pregnancy outcome. Methods: A prospective study was conducted on primipara of full-term and single-birth-fetus. Body mass index (BMI) was calculated according to height and weight of pregnant women before pregnancy, and the weight gain during pregnancy was recorded. After delivery, the complications of pregnancy and childbirth . According to pre-pregnancy body mass index and weight gain during pregnancy, pregnant women were divided into groups, and compared the incidence of obstetric complications among the groups. Results: (1) The incidence of gestational diabetes during pregnancy weight gain ≥ 12 kg weight increase than during pregnancy <12 kg; (2) With the increase in pre-pregnancy weight, gestational diabetes, labor block, gestational hypertension Disease, macrosomia are increased; which when pregnant gigantism and hypertensive disorders during pregnancy are increased; (3) before and throughout the pregnancy weight control can reduce the incidence of complications during pregnancy and complications of childbirth and can Reduce the rate of cesarean section, improve the prognosis of maternal and child health clinics have important guiding significance. (4) The different weight of different pre-pregnancy different weight gain during pregnancy can reduce the incidence of obstetric complications and adverse pregnancy outcomes, the final prenatal weight control in the appropriate range, may provide a scientific basis for the determination of pregnancy obesity standards.