During the occurrence of two strong earthquakes (M8.6 and M8.2) in Sumatra,Indonesia,on April 11,2012,a large number of underground fluid stations in China recorded abundant co-seismic response data,and data from underground fluid observations in Gansu also showed various degrees of co-seismic response. The co-seismic changes and the digital response of water levels and temperatures in Gansu during these two great earthquakes are analyzed in this study. The results show that the water level co-seismic response in most wells followed a relatively consistent change law,i.e.,the change was main oscillation variation,and rapidly recovered to its original state after the earthquake. The degree of response is closely related to the magnitude; the greater the magnitude,the stronger the response. Owing to the different response mechanisms of water level and temperature,water temperature does not follow this rule. In water temperature observations,only two wells had a record of co-seismic response,they showed approximate amplitudes and a relatively long cycle time (change period),but a slower recovery time.