Based on daily minimum temperature for 76 stations in southwest area and MJO index data during 1979~2008,the variation characteristics of persistent low-temperature processes of single station and regional and its relation with MJO index are studied by cumulative frequency method and linear trend estimation.%本文选取1979年～2008年西南地区76个台站的逐日最低气温和MJO指数资料，采用累积频率法和线性倾向估计，研究了单站和区域持续性低温过程的变化特征及其与MJO指数的关系。
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