The erhu string changing technique is an important bowing method to connect the music melody during performance. It does not have any marks in the score, and the player only needs to press the notes according to the fingering to complete. The erhu's string-changing technique can be used in both continuous and split bows, but in allegro melody, split bows are mostly used to play. When playing a split bow, it can be roughly divided into "finger active", "forearm active" and "finger-wrist combination" according to the bow movement of the right hand. Combine the movements of the big arm (ie the upper arm). Due to the fast speed of the action, if the string is changed improperly, it will cause tension or stalemate in the performance. Some even make the action of changing strings more forcefully due to psychological tension, resulting in the interruption of the sound connection at the momentary tone or the confusion of the melody. In fact, only when the melody of the music requires a warm emotion, the combination of the big arm (upper arm) is needed in the string changing technique. Except for music melodies that have special needs for dynamics, general string changing actions do not require much force. Sometimes the right hand with less strength can be more relaxed, and the feeling of changing strings will be sharper and lighter.

In addition, in addition to the improper use of string changing methods, the lack of slow practice can sometimes be the reason for the inappropriate use of skills in performance. After some players have just learned a certain skill, they refuse to consolidate it through slow practice in a down-to-earth manner. As a result, the connection process of some skills in the performance is disconnected, which affects the normal musical performance. For this reason, in the process of practice, not only should the string-changing skills be "set in place", but also the different methods of string-changing movements should be consolidated by the method of "slow practice". Only by paying attention to every technical link can we be foolproof and get the desired effect in the performance.