分析丽江地震台数字化水平摆倾斜仪在几次中强震前记录的前兆波，对其特征进行初步分析，并对其产生机理进行初步探讨。认为数字化水平摆倾斜仪的独特构造和观测点的位置，构成了丽江地震台能观测到中强地震前兆波的原因。提高对前兆波的认识，对未来的地震预测有着实际应用价值。

In this paper, the wave characteristics of several precursor waves before mid-strong earthquakes, recorded by the digital horizontal pendulum tiltmeter in Lijiang Seismic Station, were preliminarily analyzed. The generation mechanism was also discussed. It is found that the unique structure of the instrument and the location of observation point are the reasons for the precursor waves before mid-strong earthquakes having been observed by digital horizontal pendulum tiltmeter in Lijiang. This result is useful for increasing comprehension of the precursor wave in the future of earthquake prediction.