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In order to solve the problem of capacitated vehicle routing optimization, An improved quantum PSO algorithm for constrained vehicle routing optimization is proposed.Firstly, the mathematic model of VRP is given, the particle swarm algorithm is introduced;Then, an improved quantum particle swarm optimization is proposed, 2-opt and 1-1 opt and other local optimization algorithms are used to optimize the inner and outer route, The population entropy is introduced to check whether the algorithm is trapped into local optimization or not, and cataclysm is adopted to ensure the diversities of the solution spaces, and the detailed solving steps of VRP are given; By comparison with other algorithms and combining with simulation experiments, which effectively illustrates the feasibility and effectiveness of the algorithm.