This season's cup competition began with a three preliminary rounds which were played during the last two week-ends of August and the first week-end in September. The first principal round was played at the beginning of October. The competition was to be completed on Easter Monday, 18 April 1938, with the final, which since a few years, was held in the country's capital in
Bern, at the former
Wankdorf Stadium. The preliminary rounds were held for the lower league teams that were not qualified for the main rounds. The 24 clubs from
this season's 1. Liga and the 12 clubs from the
1937–38 Nationalliga joined the competition in the first principal round which was played Sunday 3 October. The matches were played in a knockout format. In the event of a draw after 90 minutes, the match went into extra time. In the event of a draw at the end of extra time, if agreed between the clubs, a replay was foreseen and this was played on the visiting team's pitch. If the replay ended in a draw after extra time, or if a replay had not been agreed, a
toss of a coin would establish the team that qualified for the next round. ==Preliminary rounds==