Abstract: In Tianjing and Mibo mountains of Ningxia, the Ordovician Majiagou Formation consists of a suite of platform carbonate sediments, and Miboshan Formation a suite of clastic rock of gravity flow sediments on the margin of the platform, with argillaceous and carbonate rocks intercalated. The leading oxides, trace elements and REE of the carbonate rocks of the two formations exhibit the relationship of temporal and spatial evolution obviously Furthermore geochemical elements show both independence of their own and correlation with each other, which are identical to their macro features as well as related to their sedimentary environments.