In this paper, the variation characteristics and the formation mechanism of the South Pacific Convergence zone ( SPCZ ) are discussed, based on the analysis of satellite cloud pictures and the streamline fields over the tropical western Pacific Ocean. 根据热带西太平洋卫星云图资料及流场特征分析,讨论了南太平洋辐合带(SPCZ)的演变特征和形成机理。