We analyzed and compared the waveforms and power spectrums of background noise of Maigaiti M_L3.1 and Mindanao M_L6.6 earthquakes recorded by broadband seismometers in borehole and at ground in Maigaiti seismic station in Kashi. We further studied the amplitude differences and structure beneath the Maigaiti station based on the records from borehole and ground seismometers. The results show a more clear and concise waveforms of earthquakes and lower power spectrum recorded by the borehole seismometer and coexistence of both similarity and difference between the waveforms and power spectrums. The crustal thickness is 50km beneath the Maigaiti station. The average S-wave velocities at a range of 0~59m deep beneath the borehole seismometer and 0~47m deep beneath the ground seismometer are 0.59km/s and 0.47km/s, respectively. The magnitudes of local earthquake and teleseism obtained by borehole seismometer are 0.518 and 0.025 smaller than those obtained by ground seismometer, respectively. The results obtained in our studies are useful to the deployment of ground and borehole seismometers as well as seismic study by using their observational data.