Using daily values of gas radon concentration from Jiayuguan fault as well as daily values of air temperature and atmospheric pressure in Jiayuguan, this paper studied the influence of air temperature and atmospheric pressure on short-term change of gas radon concentration by calculating the correlation coef-ficient between air temperature & atmospheric pressure and gas radon concen-tration.The results showed that both air temperature and atmospheric pressure had obvious influence on short-term change of gas radon concentration.① The influence from atmospheric pressure is more remarkable than that from air tem-perature.② The influences of air temperature and atmospheric pressure both had time-lag characteristic.At 0-8 o’clock,their influences on radon concen-tration were gradually weakened.The influence of air temperature was the wea-kest at 7 and 8 o’clock in a day,but the influence of atmospheric pressure was the weakest only at 8 o’clock in a day.At 9 o’clock,their influences were rap-idly increasing.Since then,the influence of atmospheric pressure became slower growth and it was up to the strongest at 18 o’clock in a day,but the influence of air temperature became slow down.③ There were significant differences in influences of air temperature and atmospheric pressure in different months.The influence of atmospheric pressure had good laws such as it was on high level state from January to April and started to decline from May and reached the lowest in August,and then,it rose and reached highest level in October,and it was at a high level.The influence of air temperature had no obvious laws and their monthly frequency values were all low.④ The analyses on related earth-quakes indicated that the short-term sharp changes of gas radon concentration had no ability to forecast earthquake.%以嘉峪关断层气氡为研究对象，利用气氡和气温、气压的日值，通过计算气温气压与气氡浓度的相关系数，分析了气温和气压对断层气氡浓度短期变化的影响．结果显示，气温和气压对气氡浓度的短期影响显著，其表现为既具有相似性特征，又存在明显的差别：①在对气氡浓度的影响程度上，气压明显大于气温．②气温和气压对气氡浓度的影响均具有明显的滞后效应，如离取样时间最近的0-8时，它们对气氡浓度的影响均逐渐减弱，但气温对气氡浓度的影响于7时达到最低，8时仍在低位变化；而气压对气氡浓度的影响则在8时达到最低值．9时气温和气压的影响都出现快速上升，之后气压对气氡浓度的影响表现为波动缓慢上升变化，18-19时达到最高值；9时之后气温对气氡浓度的影响则表现为波动缓慢下降变化．③不同月份气压和气温对气氡浓度的影响也存在明显的差异．气压的影响具有很好的规律性，1-4月为高影响状态，5月份开始出现快速下降变化，8月份达到最低值，9月份略有回返，10-12月又达到了全年的最高值；而气温对气氡浓度的影响除3月份和4月份比较高之外，其它月份都在低值变化，并且差别不大．④对震例的分析结果表明，嘉峪关气氡浓度大幅正突跳变化不具备预报地震的能力．
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