In recent years, as the public’s demands for music culture have become higher and higher, piano accompaniment has been more widely used in mass cultural activities. However, with the improvement of the public’s musical literacy, the most basic improvisational accompaniment method can no longer satisfy the masses. The needs of cultural activities require the integration of a variety of elements. Therefore, piano improvisational accompaniment has also received more and more attention. This article makes an in-depth analysis of the characteristics, application and improvement of piano improvisational accompaniment in mass cultural activities. 　　1. Application background 　　In the first half of the 19th century, the development of piano music in Western European…