User value and risk are important factors that affect the in-depth application of cloud services. To solve this obstacle, the most effective measure is to consider these factors in cloud service pricing. Based on thetraditional fixed pricing and usage-based pricing mechanisms, a mixed pricing model was constructed. Based on the single influencing factor discussed in the previous literature, the cloud service pricing strategy under the dual factors of user value and risk was studied. The research showed that cloud service providers should provide fixed pricing mechanism in the markets with low user value, and provide mixed pricing mechanism in the markets with high user value. The mixed pricing mechanism has more advantages in market share than the single pricing mechanism. As the risk increases, users prefer to purchase cloud services based on usage pricing mechanism. Transaction cost is the key to the value creation of the usage-based pricing mechanism. With the continuous reduction of transaction cost, the profit and social welfare of cloud service providers under the mixed pricing mechanism are the best.