Abstract: The progress on synoptic scale Meiyu front is summarized after 1930 s. The existed studies show that the structure of the Meiyu front is very complicated, and has a multiformity feature. Based on previous studies, the synoptics' definition of Meiyu front is given as: there exists a narrow rain band of thousands of kilometers long across East Asia and northwestern Pacific; the rain band advances and retreats closely related with the Asia monsoon, and the frontal surface is between warm monsoon air mass and the others; and the Meiyu frontal area is a band with high gradient of θse.

Key words: Meiyu front, synoptic scale, multiformity, synoptics' definition

摘要： 对几十年来国内外对天气尺度梅雨锋研究结果进行了综述，众多研究成果表明梅雨锋具有多样性的特点。由于众多研究者对梅雨锋的定义存在很大的差异，因此在综合国内外不同观点的基础上，给出了梅雨锋的天气学定义，即：梅雨锋具有一条数千公里长的横贯东亚和西太平洋地区的雨带；梅雨雨带随季风的进退而进退，梅雨锋是季风气团和其他气团之间的锋面；梅雨锋区是位于夏季风北侧的相当位温强梯度带。

关键词: 梅雨锋, 天气尺度, 多样性, 天气学定义