Abstract: Based on the Nastac model,a new capture mechanism,named node-based-correction method,was proposed to improve cellular automaton (CA) technique in the simulation of grain growth during solidification process with arbitrary crystallographic orientations.By coupling with the finite volume method (finite volume method,FVM),a FVM-CA simulation model was put forward and applied to the simulation of microstructure evolution of solidification during the arc deposition.The influences of the deposition rate on dendrite arm spacing and the growth direction were also discussed.Experiments were carried out to verify the validity of the numerical model.This research will lay the theoretical foundation of the prediction and control of microstructure in additive manufacturing.