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讨论了唐山地震前后水氡变化率动态图象的时空演化特征．用水氡月均值的变化率做参量，绘制每月的变化率平面等值线图，得到水氡的变化率动态图象．研究表明，唐山地震前震中周围出现水氡变化率≥０．０６的异常特征区．异常特征区的面积具有“扩展—收缩”的特点，并显示出阶段性．
The temporal and spatial evolution characteristics of dynamic image of water radon change rate before and after Tangshan earthquake are discussed. The monthly average rate of change of radon is used as a parameter to draw a monthly contour map of the rate of change, and a dynamic image of the rate of change of water radon is obtained. The results show that there are abnormal zones around the epicenter before Tangshan earthquake with the rate of change of water radon ≥0.06. The area of the anomaly zone has the characteristics of “expansion-contraction” and shows the stage.