Abstract：Research purposes: It was found there were some limitations and deficiencies about the sound absorption(or insulation)properties，impact resistance and their test method stipulated in”Technical Requirements and Test Method for Acoustic Elements of Railwayg Sound Barrier”(TB／T3 1 22—2005)when using the”Technical Requirements and Test Method for Acoustic Elements of Railway’s Sound Barrier”to determine the performance indexes of acoustic elements of sound barrier．In order to meet the needs of construction and the requirements of high speed of railway and low frequeney noise of train，some modification proposals are offered in this paper．
Research conclusions: This paper analyzes the limitations about the noise reduction coefficient and weighted sound reduction index stipulated in the current standard based on the spectrum characteristics and distribution range of railway sound source．ofrers the proposal that the noise reduction coefficient and weighted sound reduction index should be changed into sound absorption coefficient and transmission loss of different frequency based on related standards at home and abroad，discusses the deficiencies about the impact resistance and test method for acoustic elements of sound barrier material based on practicable railway sound barrier material，and gives the suggestions that there should be the different performance requirements and test methods for the different materials．
廖建州. 对《铁路声屏障声学构件技术要求及测试方法》的建议[J]. 铁道工程学报, 2009, 26(8): 27-30.
LIAO Jian—zhou. Proposals for“Technical Requirements and Test Method for Acoustic Elements of Railway’s Sound Barrier”. 铁道工程学报, 2009, 26(8): 27-30.
2009, Vol. 26 
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