Abstract: Quantitatire lithofacies palaeogeoaphic analysisis can provide constraints to boundary of different geotectonic units． By means of the method of "single factor analysis multifactor comprehensive mapping"，integrating several aspects of data such as palaeo-current directions and sedimentary charateristics，a quantitative study is made on the Caledonian lithofacies palaeogeography of NE Guangxi．Since the Neoproterozoic,the whole research area cracked into two different basins along the Lipu fault．0n the NW side of the Lipu fault (N and NE Guangxi)，The Caledonian basin evolved from deep-sea basin to passive continent margin basin．Its slope dipped to the southeast，and palaeo-current directions were from northwest to southeast．The terrigenous detrital sediments were derived from the northwest．However，on the SE side of the Lipu fault(E Guangxi)，the Caledonian basin had long been an active continent slope environment．and eventually evolved into a continenta1-shelf-coastal environment in the Ordovician．The slope dipped to the northwest．and the palaeo-current directions were from southeast to northwest．The terrigenous detrital sediments were derived from southeast．A1l these indicate that they belonged to different palaeogeographic systems．That is,the basin in northern and northeastern Guangxi belonged to the Yangtze plate，while the basin in eastern Guangxi belonged to the Cathaysian plate． The proof of lithofacies paleogeography suggests that the Lipu Fault is a dividing fracture which separates two terrains in the Caledonian.