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At present ,the prediction result of highway traffic noise is quite different from the actual situation ,the main reason of which is that the prediction model of the sound source is not perfect .This paper considers the actual height of highway sound source ,uses acoustic simulation software to build a sound source model whose vertical height is consistent with the actual situation ,analysis the prediction results of sound receiving points and discovers that: compared with the equivalent simple sound source model , that having considered the sound source height much more accord with the actual highway situation so that the prediction accuracy will be improved ; the difference value of the prediction results is the most prominent under three meters of barrier when the road traffic condition are all heavy vehicles and the comprehensive noise difference of the two sound source models is 1.71dB,it will reach difference value of spectrum peak for 3.03dB when the frequency is 315HZ, which will provide reference to the road traffic noise control.

Influence of Vehicle Sound Source Height on Traffic Noise Forecast and Sound Barrier Design