The paper comes up a kind of charging control method about Multi-objective search algorithm based on PSO charging control strategy which can reduce the harmonic content and power load of charging at noon to reduce the impact of the actual bus charging station running bringing to the power grid harmonic and power load. The simulation is carried on according to the charging station actual operation from the angle of harmonic suppression and power load balance by constructing the model analysis of charging stations harmonic characteristic. The simulation shows that the charge under this kind of charging control strategy can reduce the harmonic content effectively and cut down the peak load availably.