The Japan-US league,which was formed in the early 1950s,has been a product ofthe Cold War between the United States andthe
Soviet Union.Its nature as a militaryleague be-came more obvious after the Japan-US New
Security Treaty was signedin 1960.With the end ofthe Cold War andthe disaggregation of the Soviet Union,justificationfor existence of this leaguewas shattered andit then met withtremendous challenges.The Joint Declaration of Japan andtheUnited States of America signedin 1996 signaled that
relations between these two countries hadreturned to the original orientation of security.With a series of adjust ments and reinforcements,their military relation changed froma league of defense to a league concerning“regional affairs”.Consequently,the scope of their cooperation,the roles played by each party,and the contents ofcooperation have all undergone great changes.I mplementation of the Japanese strategy“to bor-row boat to sail”after the“9.11”incidence turned the original Japan-USleague which was sub-ject to the constitution of peace as“a league on paper”to an aggressive“league in action”.It hasdirectedincreasing attention to China as China gradually arises.Therefore,how we should dealwithits negative effect becomes ani mportant strategic issue.