Traditional professional erhu tuning DA: 15th string is D, 26th string is C, 3rd low 7th string is B flat, 4th (low) 1st string is A, 5th (low) 2nd string is G, 6th (low) ) 3 string is in F key, 7 (low) 4th string is in E flat key.

Self-created and commonly used amateur erhu singing accompaniment tuning CG: 15th string is C, 26th string is B flat, 37th string is A flat, 4 (low) 1 string is G, 5 (low) 2 string is F, The 6 (low) 3rd string is in the key of E flat, and the 7 (low) 4th string is in the key of D flat.

Erhu songs are sung with instrumental music, and they also talk about the range, breathing, and the best sound area. The tune of the song is determined by the composer according to the range of the human voice. When setting the tune of an erhu song, you must first look at the lowest note of the song, and then choose which tune to use for the erhu. Erhu generally uses the key of "D" (small work tune) as the basic key of erhu, that is, the inner string is set to "d"', and the outer string is set to "aI". With this tuning method, the tension of the strings is moderate, the vibration of the python skin and the resonance of the piano can be fully exerted, and the pronunciation is magnificent and powerful, so it is mostly used in solo, ensemble, unison and folk performances.