Tertiary Huimin basin is a rift basin. The Cenozoic sediments up to 7000 m thick have been accumulated within this basin. Depositional environments recognized include fluvial, delta, longshore bar and shoal, organic bank, turbidite, deep-water fan, and near-shore subaqueous fan. The sequences and models of these facies are developed. Facies maps at various times are constructed from environmental analysis of individual wells. The ascending facies sequence of the basin consists of alluvial-lake basin bog, lake influenced by the transgression, delta-turbidite, carbonate-organic bank, fluvial-lake, and fluvial facies associations. From the point of view of sedimentary tectonics, the evolution of this basin can be divided into four stages. They are initial rifting (Eocene), early rifting (late Eocene to early Oligoeene), intensively rifting (oligoce-ne), and degenerating-depressing (Late Tertiary) stages. The lithologieal associations developed are correspondingly as follows: red clastic rock, sandstone-mudstone-carbo-nate, dark mudstone-sandstone, and mottled clastic rock associations.