In response to the issue of operational costs generated when processing workflow loads in data centers,a workflow load allocation model considering bandwidth and power costs is first analyzed and established to optimize the economic costs paid by data center operators. Then,based on the characteristics of the optimization model,a heuristic algorithm is designed to solve the minimum operating cost and the allocation scheme of workflow subtasks in various data centers. Finally,a real workflow load topology and parameter settings are used for case analysis to compare three different types of workflow load topologies and two common workflow load allocation methods. The results verify the role of the comprehensive consideration of bandwidth traffic cost and power cost model in reducing the total operating cost of the data center.