Abstract: Feng Qi’s concept of dialectical argument is closely similar to Johnson’s concept of argument that takes the dialectical tier as an essential component of argument, so it is possible for the two to combine and complement with each other. On the one hand, with the help of Johnson’s proposal for the typology of the dialectical materials and his elucidation of the criteria for the dialectical adequacy, we can better comprehend the contributions and limitations of Feng’s concept of dialectical argument; Feng’s seeing “achieving unanimity through the contention of diverse opinions” as a universal law of the contradictory movement of thinking and knowing can, on the other hand, lay a more solid foundation for the justification of the arguer’s dialectical obligation.