The platform- basin alternation pattern is an important feature of Devonian and Carboniferous sedimentation in northeast Guangxi, and the D/C boundary is one of the most prominent periods of this feature. This paper reviews the research history, facies division and representative sections of D/C boundary in northeast Guangxi. It is considered that the D/C boundary can be divided into the clastic rock facies, the carbonate rock facies and their transition facies. Through the comparison of lithologic characteristics of 20 representative sections, the lithofacies palaeogeography of relative sea level decline period of D/C boundary in northeast Guangxi has been restored. The results show that in this period, there were two major platforms in Liuzhou and Guilin areas and several small platforms in other places. Deep water sediments with rapid facies transformation were well developed among platforms. In the early Carboniferous, the seawater became shallower. The distributions of platform facies were significantly expanded and the supply of the Jiangnan massif was increasing. This led to the pattern of platform- basin alternation was enhanced. In order to further explore the evolution process and the controlling factors of sedimentation of the D/C boundary in northeast Guangxi, this paper discusses the stages of the platform- basin alternation evolution, the influence of the synsedimentary tectonism and the sea level changes. And relationship between sedimentary environment differentiation and tectonic movement- sea level changes has been sorted out. It is considered that under the premise of continuous faulting of Yunnan- Guizhou- Guangxi rift basin, the main reason for the sedimentary division of D/C boundary in Northeast Guangxi may be the abnormal fluctuation of sea level caused by the Gondwana glaciers. And the local synsedimentary fault depression increasing caused by Liujiang movement intensifies the sedimentary differentiation. The coupling effect of tectonic and sedimentary factors reached the strongest at the D/C boundary, and finally promoted the platform- basin alternate pattern in northeast Guangxi to reach its peak at this period. In this model, the evolution of platform- basin alternation can be divided into 4 stages in northeast Guangxi. The middle- late period of Early Devonian was the bedding stage of the platform- basin alternating pattern. The late period of Early Devonian to late period of Middle Devonian is the development stage while sedimentary facies began to differentiate. The Late Devonian to Early Carboniferous was the prosperity stage, the abnormal decline of sea level and the Liujiang movement began to act on the sedimentation. After the Carboniferous, the platform- basin alternating deposition maintained the intensity, and the seawater gradually returned to normal in the late period of Early Carboniferous, the basin- alternating pattern gradually weakened.