為改善傳統胡琴演奏時，高音有音量較弱、明亮度較差，以及合奏時音色統一的問題，香港中樂團以聚酯薄膜取代蛇皮，並擴及整個胡琴類家族。本論文由頻譜分析角度出發，檢視環保二胡、環保高胡、環保中胡和環保革胡等，有關音色的數據，從而由對此議題提出看法。

To improve the traditional erhu, the treble volume is weak, poor brightness, as well as the problem of unified sound, Hong Kong Chines e Orchestra to replace when the ensemble snakeskin polyester film, and spread throughout the violin class family. In this paper, by spectral analysis perspective view of environmental protection erhu, environmental Gaohu, environmental Zhonghu and environm ental gehu in Hu et al., On the Timbre of data to put forward their views by this issue.