The beam-beam effect in a linac/ring B factory is studied here using strong-strong simulation based on a macroparticle model. Included in the ring dynamics are the linear betatron oscillation and synchrotron motion, as well as the transverse and longitudinal damping and quantum excitation. As a benchmarking test, the coherent quadruple effect in a ring/ring collider was observed by the simulation. The simulation shows that in a linac/ring collider, the stability of the storage ring bunch is strongly affected by the synchro-betatron coupling induced by the deep envelope modulation of the highly disrupted linac bunch. However, with the initial conditions for the linac bunch properly chosen, the beam-beam tune shift limit of the ring bunch can be made comparable with that for a ring/ring collider.
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