expressed a sad mood. Liang Qiaobai's piano music in the teahouse expresses complex and sad emotions, and the kind of emotional expression people feel when they hear this music. This kind of music expresses the inner emotional state of the characters. In music expression, adagio is adopted and it is expressed in a gentle and euphemistic way, which neither affects the content to be expressed by music nor affects the emotional state expressed by music. But this musical expression is very accurate and fluent.