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应用应力应变理论，论证了在正常地壳应力作用下，地下流体动态处于稳定状态；中强地震发生前强烈应力作用下地下流处动态处于失稳状态。据此，提出地下流体动态稳定度的概念，给出了便于综合分析的地下流体动态稳定度的计算方法，应用于地震分析预报。对中强以上地震前地下流体观测资料的计算结果表明，地下流体稳定度异常显著，获得了较好的效果。
The application of stress-strain theory shows that under normal crustal stress, the dynamic of underground fluid is in steady state and the underground flow place is in unstable state under strong stress before moderate-strong earthquake. Therefore, the concept of dynamic stability of underground fluid is proposed, and the calculation method of dynamic stability of underground fluid for comprehensive analysis is given, which is applied to earthquake prediction. The calculation results of the observed data of the underground fluid before the strong earthquakes above mid-strong suggest that the stability of the underground fluid is abnormally remarkable and good results are obtained.