Abstract：In this paper, we study the original observation curve of the minute value of the first component of the 2007-2014 strainmeter at Guza station. The statistical results show that the daily and monthly anomalous total amplitude, frequency and time are significantly increased before the Wenchuan earthquake. The daily and monthly cumulative value curves increase rapidly, and the rate slows down after 2008. The maximum phase difference is 10, 9 and 4 times. So, it has a strong corresponding relationship with the Wenchuan earthquake. However, the process of the subsequent earthquakes in Lushan and Kangding does not reappear. According to the results of in-situ stress measurement and visual stress analysis in the Longmenshan area, this phenomenon has been explained to a certain extent.