二胡是我国民族乐器中的重要乐器,为广大工农兵群众所喜闻乐见。但是二胡音量较小,上下把位音量不平均,高音区声音既闷暗又微弱,随着革命样板戏的普及,文艺革命不断深入发展,二胡在这方面的缺点也越来越突出。广大专业与业余二胡演奏者,都强烈希望对二胡进行改革。要扩大二胡音量特别是高音区的音量,关键在于改进二胡的琴筒(即共呜箱),使之更科学合理。二胡的琴筒大体上有正圆形、正六角形和正八角形三种,尽管这三种形状各有共 Erhu is an important instrument in our nation’s national musical instruments and loved by the masses of workers, peasants and soldiers. However, the volume of the erhu is relatively small, the volume of the upper and lower parts is not even, and the sounds of the treble area are both dull and faint. With the popularity of the revolutionary model operas and the continuous development of the literary revolution, erhu’s shortcomings in this respect have also become increasingly prominent. The vast majority of professionals and amateur erhu players are strongly want to reform the erhu. The key to amplifying the volume of the erhu, especially the high-pitched area, is to improve the erhu’s harp (ie, the common box) to make it more scientific and rational. The erhu piano harp generally has a positive circle, a regular hexagon and a regular octagon three, although the three shapes each have a total of