Japan　was　hit　by　a　massive　9.0-magnitude　earthquake　that　triggered　a　tsunami　10-23.6　m　high　and　leakiness　of　nuclear　power　on　March　11,　2011.　This　earthquake　caused　very　heavy　loss.　The　9.0-magnitude　epicenter　has　been　located　38.1°N,　142.6°E.　As　early　as　July　25,　2008,　Institute　of　Earthquake　Prediction　of　Beijing　University　of　Technology　had　made　an　internal　earthquake　prediction　(Prediction　of　Strong　Earthquake　and　Tsunami　in　Japan)　based　on　five　different　types　of　precursor　anomalies　appearing　at　that　time.　Actual　earthquake　was　just　within　the　region　of　the　prediction,　and　truly　caused　devastating　Tsunami　with　a　height　of　10　m.　Before　the　earthquake,　five　types　of　precursory　signals　were　received.　This　shows　that　an　earthquake　above　7-magnitude　is　formed　a　energy　accumulation　process,　and　a　few　years　ago　some　precursory　information　appear.　Imminent　anomalies　will　appear　in　succession　a　few　days　before　earthquakes.　Capturing　this　information　for　earthquake　prediction　prevention　is　very　important.