The Crustal Deformation Observatory Network of China Earthquake Administration equips with many kinds of crustal deformation observation instruments. These instruments have recorded the earth's free oscillation excited by the Japan M_W9.0 earthquake. All of the spheroidal oscillation modes(₀S₃~₀S₃₀)and toroidal oscillation modes(₀T₃~₀T₂₀)excited by the Japan M_W9.0 earthquake were detected through processing and analyzing those single or multiple group observation data. In addition,through comparing the different detective results obtained by those instruments,we analyze their capacity to observe different kinds of oscillation and different frequency band modes. We find that,the vertical pendulum tiltmeter has the best result for observing spheroidal oscillation. Because of the high noise in low frequency band,the borehole tiltmeter cannot observe the low-order spheroidal oscillation. The multi-component borehole strainmeter has a best result for observing toroidal oscillation,and the tunnel extension meters can only observe some low-order modes.