Based on the stable isotope analysis of precipitation from January to October in 2014 in Zhenglanqi region of Inner Mon-golia,the characteristics of hydrogen and oxygen isotopes for precipitation were analyzed.The results show that theδ18 O value is high in summer and low in winter.Compared to the global meteoric water line equation,the latest local meteoric water line equa-tionδD = 7.52δ18 O + 2.57 has a lower slope,indicating the local precipitation experiences evaporation effect to some extent.As to the annual scale,the relationship betweenδ18 O in temperature is positive correlated,butδ18 O is not negative related to precipi-tation amount.And the variation of stable isotopes is influenced by Asian summer,winter monsoon and its vapor.%在分析内蒙古正蓝旗2014年1－10月当地68次大气降水中同位素数据的基础上，结合研究区的气象资料，对当地大气降水中氢氧稳定同位素的季节变化特点、影响因素及水汽来源等进行研究。结果表明：正蓝旗地区大气降水中δ18 O 具有夏高冬低的变化特征，而 d 值具有冬高夏低的特征；正蓝旗当地大气降水方程线为δD＝7．52δ18 O＋2．57，该方程斜率小于8，表明正蓝旗地区蒸发程度较强；当地大气降水中δ18 O 体现出较弱的温度效应，但是不存在降雨量效应；从全年月尺度来看，正蓝旗大气降水夏季水汽来源于东南湿润地区，冬季则来源于西北干燥地区。
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