In the phonological training of the clarinet, the beginner performs according to the diagram of the finger table. In the course of this learning stage, because the player's ability is low, the new finger can not be found outside the finger table. Of course, the finger table is summed up through the continuous performance practice of predecessors, but with the development of the times, the enrichment of practical performance forms and the continuous improvement of playing technology, people will make up for and expand the pitch of some sounds on the original finger table. Nowadays, players can improve the accuracy of sound by auxiliary keys during playing. The use of auxiliary keys is aimed at the pitch of some special sounds. a1 sound, for example, can be used to tune the a1 sound when playing Victor Babin's HinandaleWaltzes》 fifth waltz. Practice.