This study present to operator system about performance method by diagrammatic and analysis based on Petri Nets when accordion is performed. Especially, this study present to the basis an automatic performance education by visibility according to divide place and transition of correlation of musical objects. In this, our purpose is flexible performance of deadlock-freeness by visibility of operating process and detail of marking. This study is effective and useful of understand to performance process by Petri Nets modeling inclusive of many musical instrument. The first time, this study suggest performance model of accordion based on Petri Nets and verify of efficiency, an example.