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This paper analyzes the trend of water radon data from Bengbu seismic station since April 15，2020. It is found that radon in Bengbu station is fluctuating. Through environmental investigation，comparison of meteorological factors and pumping sampling test，it is concluded that the change of radon in water has a positive and significant correlation with air temperature and water temperature. The air temperature changes the water temperature，and then changes the solubility and degassing rate of gas，thus causing the change of radon measurement value in water. According to the analysis results of previous earthquake cases，air temperature may not be the only factor causing the drop in radon readings. It should be the result of the interaction of environmental disturbance and earthquake precursory information. It is concluded that the reduction of correlation coefficient between water radon and temperature is related to the surrounding earthquakes.