Abstract: To analyze the composition elements of architectural logic in metro stations, the impact of different architectural logic elements on architectural form is revealed, the methods of applying architectural logic in the design process are studied, and the problem of architectural logic reasoning in metro building form is solved. By tracing and analyzing the environment and functions of Guangzhou Metro Line 3 interchange station Caihongqiao Station building, explanation and derivation is carried out from the two directions of the environment→method→form and function→layout→form. The station foundation location and buried depth, column grid span, and station form are derived based on the building environment of Caihongqiao Station. The burial depth, layout, and interchange form of the station are derived from architectural functions, and the implementation plan, equipment and decoration form of the station are determined in the end.