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The flocking phenomenon has been exploring in many points of view. In simulating a flocking, there are some models that capable describing it in a quantitive way such as the Vicsek model. In nature, Instead of a bird pay attention to all of the birds while doing flock, the bird only has to pay attention to the nearest-neighbor. It is costly during the simulation if a particle has to check its location relative to the whole of particles. Therefore, we serve an optimization method to handle it. There is quadtree, a tree data structure that will take a space then section it in four sections so on. This paper shows the approach by simulation of the large-scale flocking system to be more efficient.