羊水过多是指在妊娠晚期羊水量达到或超过 2 0 0 0ｍｌ者。其发病率为 0 2 %～ 1 6 %。正常羊水量随妊娠周数增长而有所增减 ,妊娠 16周时约 2 5 0ｍｌ,妊娠足月时达80 0～ 12 0 0ｍｌ,过期妊娠羊水量减少 ,约 5 5 0ｍｌ。羊水过多可分急性和慢性两种。羊水量在数天内急剧增多 Too much amniotic fluid refers to the amount of amniotic fluid that reaches or exceeds 200 ml in the third trimester of pregnancy. The incidence rate of 0 2% ~ 16%. Normal amniotic fluid volume increases with the number of gestational weeks have increased and decreased, about 16Octures at 16 weeks of pregnancy, gestational full-moon when 80O ~ 12Oml, amniotic fluid volume of expired pregnancy decreased, about 550ml. Amniotic fluid can be divided into two kinds of acute and chronic. Amniotic fluid increased dramatically in a few days