Based on on-site cross sections, regional geology, publications, this paper discusses its sedimentary system types, features and distribution of Nanpanjiang basin, and forecasts the prospecting shale-gas zones on the basis of the distribution of deep water fine grained sedimentary facies. The Devonian in Nanpanjiang basin develops river delta, where holds eight sedimentary systems, continental debris offshore, continental debris inner shelf, continental debris outer shelf, restricted platform, open platform, platform margin, slope and deep sea. In the early Devonian, there is no sedimentation in most Nanpanjiang basin except the southern Qinfang area. The transgression northward forms a widely-spreading river delta, continental debris offshore sedimentary system. During the middle Devonian, the continental land diminishes with a decreased supply of continental source, river delta-debris offshore only distributes along the land margin as deep water sedimentation largely expands. Between them is widely-spreading constrained/open platform sedimentation, featured by carbonates. Entering the late Devonian, lands diminishes further, short of continental supply. River delta-debris offshore facies only distributes the margin of Yunkai continent, between them is also the carbonate-featured constrained/open platform sedimentation. According to the distribution and buried depth of deep water facies, Nandan, Ziyun, Fushui and Guangnan area are of shale gas potentials, also Yongfu-Luzhai-Pingle-Wuxuan area is worthy attention.