The all sky spectoscopic survey is very important both in extra-galactic and Galactic studies. The Large-Sky-Area Multi-object Fiber Spectroscopic Telescope (LAMOST) has successfully completed its engineering work and inaugurated in October of 2008. Now it is in the commissioning stage. In pursuit of the all sky spectroscopic survey, a southern LAMOST is proposed. Tecnically, the Southern LAMOST will be mainly a copy of present LAMOST in Xinglong, China, which is located at about latitute +40 degrees. Modifications are to be made for much better image quality and thinner optical fibers to match with the better seeing condition in the Southern site. There will be 6000 or 8000 optical fibers used on the focal surface to get the highest spectrum acquiring rate, and will be equipted with about 12 to 16 spectrographs with 24 to 32 CCD cameras. Southern LAMOST is going to be built by international collaboration.