With the increasing development of power market and growing attention to power quality（PQ） problems， the quality factors are inevitable to be considered when making price of power. In this paper， the market environment and technical condition are discussed， then a PQ service pricing approach based on differential pricing is proposed. This method fully considers the solutions and problem costs of PQ， as well as the response of customers. Calculation results of RBTS-Bus 3 system by using the proposed method show that it can reasonably realize the principle of“higher quality， higher price”， and can be an effective way of pricing power according to its quality.