We study the variation patterns of geothermal observation data at Dulan seismic station,in a range of global earthquake with M_S≥7.0 and domestic earthquake with M_S≥5.0 since June 1,2013,and find that 8 moderately strong earthquakes have obvious coseismic changes of reaction. Among them,the amplitude of coseismic variation is positively correlated with the maximum amplitude of seismic wave,especially with the maximum amplitude of horizontal synthesis. The morphology of coseismic variation is related to the tectonic location of the earthquake. When the location of the earthquake is directly related to the location of the borehole and the magnitude is larger,the pattern of the coseismic change is decline-flat,and the other regions of the earthquake are the decline and recovery. At the same time,the change mechanism of coseismic variation of ground temperature is discussed,and it is considered that the coseismic variation of geotemperature may be caused by the thermal energy field,which is resulted from the energy of seismic wave.