5 strong earthquakes with MS6.1～7.1 occurred in the Molukka Sea，during the period of September～December,2014，and there were co-seismic responses of the gPhone gravimeter at the Beijing seismic station. In this paper，we study the characteristics of co-seismic response in 4 aspects：head wave，response of seismic band，deformation range，and co-seismic duration. In addition，the gPhone gravimeter response is compared with that of the STS-2 broadband seismometer. The results show that compared with the broadband seismometer，the gPhone gravimeter can also provide rich information of ground motion caused by the earthquake，and has its own characteristics.