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对城市轨道交通噪声的主要声源及声源性质进行了研究．经过理论分析和推导，提出了线声源的处理方法，给出了城市轨道交通噪声声级与车流密度（车流量）的关系表达式及关系曲线．
The main sound source and sound source of urban rail transit noise are studied. After theoretical analysis and derivation, this paper puts forward the processing method of linear sound source, and gives the expression and relationship curve of the relationship between urban sound track noise level and traffic density (traffic volume).