The traditional Pingli Heizai dialect takes shadow play as the main form of expression. The singing method of "playing in different classes" has no performance; Modern Heizai dialect retains its modal characteristics, enriches the accompaniment music and makes Heizai opera more perfect. The rich modes make Black Boy Accent suitable for all kinds of dramas. There are more than 800 traditional dramas alone, which is beyond the reach of ordinary small dramas.