Within each group, the teams would play a double round-robin to decide their league position.
The four group winners and the four runners-up contested a play-off round to decide the two promotion slots.
The game was drawn, however, at this time, extra-time in matches had not yet been introduced.
FC Monthey were declared winners due to goal-average of the regular season.
[9] The decider match for second place was played on 4 June in Olten.
FC Red Star Zürich win and remain in the division.
FC Frauenfeld win 3–1 on aggregate and continue to the finals.
FC Frauenfeld win 3–2 on aggregate and are promoted to 1978–79 Nationalliga B.