In this paper the main noise source of SQ6450 type light car was judged by means of spectrum and correlation analysis of noise signal.The corresponding proposal reducing noise was presented.

• 对SQ6450轻型汽车进行了噪声测试，通过对噪声信号的频谱分析和相干分析，找出了主噪声源，并提出了降噪措施。