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Abstract. Nowadays, more and more people focused on the power supply using experience, which means people paid much more attention to the power quality of urban grid. With the development of the area of city, there are many factories are involved in the urban region, which causes much more power quality problems than before. In this article, we analyzed several evaluation methods of power quality used for now, then we make a deep research about the characteristics in power supply of urban region. And with the construction work of harmonic monitoring platform of State Grid, we need to make a quick judgment for some special supply point, such as government, hospital, bank and so on. At last, we put forward a new power quality evaluation method for urban region, which is based on the unique power quality parameters of power supply in city. This method is established by four elements, which are: harmonic voltage, harmonic current, voltage change and power, all these elements constitute a new method to evaluate the power quality of urban region in a short time.