The Paleoproterozoic Mporokoso Group in the Mporokoso Basin of north- eastern Zambia is an important stratum for the study of fluvial to shallow- marine sedimentary succession and basal components of the early Precambrian. In this paper, based on the study and systematic summary of lithostratigraphic composition, sedimentary age and environment, combined with the measured section of Mbala Formation and its clastic petrological and geochemical analysis data in the region, the following knowledge is obtained: The Mporokoso Group is supposed to be formed later than 1860 Ma, and the overlying Kasama Group is supposed to be formed later than 1434 Ma; The sedimentary environment of the Mpolokoso Basin mainly includes: braided rivers, alluvial fans, lakes and shallow seas; The clastic rocks of Mbala Formation at the bottom of Mporokoso Group are mainly derived from basement granite of the Bangweulu Block and formed under the passive continental marginal tectonic setting; The Mporokoso Basin may belong to the passive continental marginal basin; Geochemical analysis data have shown potentials for gold and uranium prospecting in the eastern and northern parts of the basin, respectively.