CCAST, World Lab, Beijing 100080, Peoples R China
; CAS, Inst High Energy Phys, Beijing 100049, Peoples R China
; Chinese Acad Sci, Grad Sch, Beijing 100049, Peoples R China
We study the final state interaction effects in B -> KK decays. We find that the t channel one-particle-exchange diagrams cannot enhance the branching ratios of (B) over bar (0)-> K-0(K) over bar (0) and B-->(KK-)-K-0 very sizably. For the pure annihilation process (B) over bar (0)-> K+K-, the obtained branching ratio by the final state interaction is at O(10(-8)).