Abstract: Combined with the actual grid data and latest travel information in the U. S., the regularity curve of charging time was fitted, which was based on the PEV types, distribution grid power limits together with different seasons and time. The impact model of charging regularity for the plug-in electric vehicle was also proposed. The simulation examples indicated that the proposed model can well reflect the impact in different time, penetration and seasons practically and accurately, and will help to strategize the distribution grid construction, safety monitoring, and optimized scheduling of plug-in electric vehicles.