Based on measurement at the side，the frequency features oflightweight railway traffic noise are investigated．The advantages and shortages of various noise barrier are analyzed．Two new kinds of barriers for railway traffic noise are designed specially，which combine the characteristics of absorption material and resonance absorbers．With the help of their distinct structure，the new barriers can be prevented from the damage of rain and dust．The experiments in reverberation chamber show that the absorption coefficients on 100－4000Hz，the main frequency range of lightweight railway noise，are satisfyingly high．This novel barrier can be considered as an effective technique to control the traffic noise from urban railway．%在现场测量、实验的基础上，研究了轻轨交通噪声的频率特性，分析总结了目前常见声屏障的优缺点。开发研制了两种阻抗复合型声屏障，由于其独特的结构设计，声屏障有能够防止雨尘侵害的显著优点。混响室测试表明，在轻轨交通噪声的主要频率范围100－4000Hz内，该声屏障的吸声性能十分出色。性能优良的新声屏障是治理城市轻轨交通噪声的一种很好手段。
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