By means of the method of experimental phonetics,this paper studies the pitch feature of mono syllable tone of Wu dialect in Xiangcheng district,Soochow city.According to the acoustical ex-periment data and tone marks of five degrees,it determines the tone value of 8 categories.Also the difference between city tones is that those of Yangshang and Yangqu haven't been merged.Tonal pattern charts can confirm the category of Yin and Yang ’s high and low distribution characteristics in this dia-lect after devoicing.%运用实验语音学方法研究相城区吴语单字调，根据声学实验数据和五度标调法确定该方言8个调类的调值，发现与市区吴语不同之处是阳上调和阳去调还未合并。用声调格局走势图印证该方言浊音清化后阴阳调类的高低分布特点。
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