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用整体的观点、综合的方法研究了１９８８年澜沧－耿马７．６、７．２级大震前８年中澜沧、腾冲、洱源３个地震台单台波速比（简称波速比）的动态变化过程，发现自１９８３年始，远在２５０ｋｍ以外地区发生的中强震、强震可引起澜沧地区波速比突变，其突变幅度随大震的临近和距离的逼近而增大。对波速比突变数据的可靠性进行了多方面的论证，并对波速比突变异常在地震预报中的应用及其物理成因进行了探讨。
With a holistic view and a comprehensive method, the single wave velocity ratios of three Lancang, Tengchong and Eryuan seismic stations in the 8 years before the 1988 Lancang-Gengma 7.6 and Ms7.2 large-scale earthquakes (the wave velocity ratio ), It is found that the strong earthquakes that have occurred in the area beyond 250km since 1983 are able to cause the abrupt change of the wave velocity ratio in Lancang area. The magnitude of the abrupt change increases with the approaching of the large earthquake and the approximation of the distance. The reliability of the wave velocity ratio abrupt data has been demonstrated in many aspects. The application of abnormity of wave velocity ratio in earthquake prediction and its physical causes have also been discussed.