As one of the core components of enterprise information system, accounting information systems is facing double pressure from the enterprise management environment and the development of accounting discipline, and the functional application-oriented accounting information system is unable to meet the needs of modern enterprise management. To improve the accounting efficiency of enterprises, this paper proposes a process-aware accounting information system based on data mining to improve business process management, hoping to provide some reference values for the design of the accounting information system of enterprises. Based on this paper, the advantages and disadvantages of typical accounting information system construction methods are analyzed and compared, and the feasibility of process-aware accounting information systems for improving business process management is analyzed in terms of enterprise efficiency, accounting cost, accounting time, risk, and control quality. The feasibility of improving the process-aware accounting information system for business process management is analyzed in terms of enterprise efficiency, accounting cost, accounting time, risk, and control quality. The results show that the process-aware accounting information system with improved business process management is economically and effectively feasible, saves time, reduces accounting risks, and improves management control quality of the enterprise. The process-aware accounting information system with improved business process management reduces the accounting cost of enterprise Y. The accounting cost before is between 100,000 and 200,000, while the accounting cost after using the new system is between 80,000 and 100,000. Company Y’s accounting behavior, logic, and convenience satisfaction increased by at least 10-20% with the new system. So, in general, the process-aware accounting information system for improving business process management helps companies to grow and manage.