The Ailao Shan fault zone in West Yunnan represents a suture boundary between South China and Indosinian Cratons. Preliminary paleomagnetic results from three sites in Sichuan, Guichou, and Yunnan Provinces reveal a 14¿ northward migration of South China Craton between Late Permian and Middle Triassic. The two cratons were separated by about 20¿ latitudes during the Early Traissic. The tectonic setting of East Asia during the Triassic was probably analogous to the present Indonesian region.