Abstract: During the Late paleozoic, SW China was located at the passive continental margin of South China plate. From Middle to Late Devonian,a series of NW and NE rift(with the dominant orientation of NW)occurred to East Yunnan, South Guizhou and the whole Guangxi province,thus forming grabens and horsts. This topographic feature then developed into interplatform rough and isolated platform framework. Generally,tLe deep water environment of this area can be influenced by gravity flow and is much different from the subdeep water interplatform trough and inherited deep water interplatform trough respectively.

Key words: deep water environment, interplatform trough, organisms feature, biofacies, Late paleozoic, Yunnan, Guizhou and Guangxi provinces