本人主要结合在我院自1988～1998年近10年分娩的200例早产(孕满29～37周间)妇女情况,对其进行社会因素的探讨.1 环境因素妊娠的妇女被动吸烟:我们调查早产的妇女在妊娠期间每日被动吸烟5支以上者占89.76%,基本不接触吸烟环境的只占10.24%,结果表明孕妇被动吸烟作为一个危险因素暴露出来,非吸烟的孕妇由于暴露在吸烟的环境而增加了危险性,它可以造成早产的机制主要是烟雾中的一氧化碳引起的胎盘供血不足所致. I mainly combined in our hospital from 1988 to 1998 nearly 10 years of delivery of 200 cases of premature delivery (29 to 37 weeks pregnant women) the situation of their social factors to explore.1 environmental factors pregnant women passive smoking: our survey Premature women during pregnancy more than 5 daily passive smoking accounted for 89.76%, the basic non-exposure to smoking only 10.24%, the results show that passive smoking as a pregnant woman exposed as a risk factor for non-smoking pregnant women due to exposure to smoking Environment and increased risk, it can cause premature birth mechanism is mainly caused by carbon monoxide in the placenta caused by insufficient blood supply.