Abstract: On September7.2010,in the watersnearthe Diaoyu Islands,boatcollision suddenly broke outbetween China and Japan,attracting worldwide attention.On Septem ber24,Japanese Naha DistrictPublic Prosecutor's sudden announcem entofthe release of the Chinese mastersproclaimed the sudden end ofthisconflict.However,the eventcaused atrem endousim pacton Sino-Japanese relations,and iteven can be considered asacrisis.M oreover,the conflictalso lefta lotofsuspense:Who directed the incident,which powerplayed behind the scene,Why did Japan suddenly shiftfrom hardline attitude,how is the future direction of China-Japanese relations,and so on.Thispaperwillstudytheevent,in answer to the sequestions based on the interpretation of the event behind Japan'sChinastrategy.