Abstract: The coexistence of "complexity" and "developing" is the whole characterization of the current Sino-US relationship where Taiwan issue is the most realistic and sensitive problem.It can be said that the Taiwan element is the biggest variable and the most stable constant of variables to the Sino-US relationship.Taiwan element is obviously differential in the specific weight of benefits cognition of both China and America.Comparatively speaking,the United States is in a super position but the time and space factors are all advantageous to our changing the current Taiwan Strait strategic structure in gradually.