1, Tone sandhi: The northeast folk songs are mainly in minor, and the national mode is mostly Gong Zheng mode, while Shangyu mode is less. Errenzhuan has the musical characteristics of "nine tones, eighteen tones and seventy-two hi", and its ten main tones are bound to play a leading role in the tune of Errenzhuan.
2. Different forms: "Northeast Folk Songs" is a song form based on the northeast dialect, with folk life, labor, love and war as its theme. Its musical style is characterized by simplicity, boldness, simplicity and passion. Errenzhuan is a local opera performance form that spreads in northern China. Usually two actors perform duets, answers, jokes and imitations on the stage, which often involve local folk stories, legends and customs.