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This paper presents the virtual machine resource allocation algorithm based on business characteristics under a cloud computing environment. This algorithm describes the user service characteristic time delay factor and price factor and other parameters, resource scheduler computing data center according to the user on the business characteristics of the description and the status of cloud calculated the cost of the business index. According to the cost index distribution of cloud computing resources, firstly the system model of the algorithm is introduced, and then the model is established according to the corresponding problem of the system model, and then the corresponding resource allocation scheme is proposed. Finally, the performance of the algorithm is verified by simulation. The simulation results show that the proposed algorithm in cloud computing platform improves the utilization rate of resources and at the same time significantly reduces the computational characteristics of different business users of cloud use cost, and improves the cloud user service experience.