Abstract: In this paper，an optimal allocation algorithm for infrastructure services is proposed to solve resources allocation in the cloud computing.The key principle lies on the estimation of resources parameters based on the meta-zone.A minimum meta-zone is chosen which satisfies the requirements of user applications to improve the efficiency of infrastructure services’ resources.The detail implementation of the theory has three steps.Firstly，an infrastructure services model on the basis of meta-zone is constructed.Services model is composed of meta-zone controller，meta-zone nodes and user’s services.Secondly，an adapting model is proposed to map the user application to the meta-zone resource.Then the meta-zone schedule algorithm is proposed.The experiment appraises the method，and it achieves the good effect.

摘要： 针对云计算中基础设施服务资源分配问题，提出了一种最佳分配决策算法。该算法通过估计待选元区间的资源配额参数，选择一个最小的满足用户应用要求的元区间，提高了基础设施服务资源的利用率。首先给出了基于元区间的基础设施服务模型，其次给出了云用户应用以及元区间资源之间的适应模型，最后提出了元区间决策算法并对该算法进行了系统地评价，该算法取得良好的效果。