In cloud computing, user data storage and computing process are all carried out in the cloud, and the homomorphic encryption technology is used to realize end-to-end aggregation encryption. The objective requirements and development trends of the construction of financial and accounting information systems of banks in my country are discussed. Transaction and accounting Separated Yinqiao financial accounting information system. The primary task of BPM is to ensure that the business process of the enterprise should be oriented to customers and market demands, and then it studies the robustness of financial information systems, saving energy and bandwidth. At the same time, the track graph topology is constructed so that each node has multiple parent nodes, and when the link between the node and the main parent node fails, other parent nodes can repair the aggregated value.