Under the constraints of distribution transformer capacity and customer charging needs， a plug-in electric vehicle coordinated charging model in charging stations is proposed to maximize the overall economic benefits of charging stations. Monte Carlo simulation method is utilized to generate the charging needs of customers based on actual customers charging profiles. The economic benefits of charging stations and distribution transformer load scenarios are simulated under uncoordinated and coordinated charging modes correspondingly. Simulation results have indicated that by responding the time-of-use electricity prices， the economic benefits of the charging stations can be significantly improved. On the other hand， due to the relatively cheaper off-peak electricity price at late night， using this coordinated charging strategy might introduce charging concentration and hence another peak load.