Abstract: The fuzzy fractal dimensions values were calculated from the data of escaped radon and water level in wells in the epicenters and their vicinities of Heze Ms5.9 earthquake, shandong Province,on November 7,1983 and Sheyang Ms4.6 earthquake, Jiangsu Province, on October 22, 1992,by the fuzzy fractal dinension formula, the result showed that there were decreases of fuzzy fractal dimension before earthquakes and the anomalies were more obvious than that of the original observation.