Abstract: Based on the tectonics of the Central African Shear Zone (CASZ), how the CASZ controlled the formation and evolution of
the Doseo Basin was analyzed in this paper. The evolutional stages of the basin were divided, the basin structure was analyzed, and the
formation mechanism of the basin was discussed. Results show that the CASZ developed two periods of strike-slip processes which
were strong and weak, respectively. The strike-slip strength controlled the evolutional stages of the basin, i.e., transtensional,
transpressional and depression stages, The transtensional stage was the main formation stage of the Doseo Basin; in contrast, the
transpressional stage was the structural setting stage of the basin. The eastern and western parts of the basin developed different
strength transpression in the transpressional stage. As such, the basin was formed to a division of eastern main depression and western
transpression zone. The eastern main depression developed weak transpression, and it had asymmetric double-fault structure. In
contrast, the western transpression zone developed strong transpression, stratigraphic deformation, inversion of the Borogop II fault, and
formation of large positive flower structural area. Transtensional and transpressional activities controlled the structural styles of the
Doseo Basin in two types of structural styles and five sub-types. Transtension which was formed in right step-dextral controlled the
formation of strike-slip pull-apart basin.

Key words: tectonic evolution, transpression, structural style, formation mechanism, Doseo Basin