We study the dynamic behaviour of two intracellular calcium oscillators that are coupled through gap junctions both to Ca2+ and inositol(1,4,5)-trisphosphate(IPa).It is found that synchronized anti-phase and in-phase oscillations of cytoplasmic calcium coexist in parameters space.Especially,synchronized anti-phase oecillations only occur near the onset of a Hopf bifurcation point when the velocity of IP3 synthesis is increased.