In order to improve based on financial shared services, enterprises can better promote the establishment, deepening, and optimal development of their own management accounting informatization. This paper introduces BPM system, analyzes the process perception accounting information system of business process management, and verifies that process perception can promote the research of accounting information system with the help of case analysis. Based on the problems, optimization scheme, and optimization effect of JKJT accounting informatization in a city, this paper makes a practical analysis and case analysis method. It is proposed that the four optimization effects of JKJT accounting informatization can be obtained by improving the authenticity and accuracy of subsystem business data, standardizing the division of personnel post rights and responsibilities, strictly implementing the system, changing the cost accounting method, and strengthening the training of management innovative accounting informatization talents and other optimization measures. Its main financial indicators show that the operating cost of JKJT in City A in 2019 was RMB 90.0309 million, a decrease of RMB 8.1781 million over 2020, a year-on-year decrease of 8.33%, mainly due to the establishment of financial sharing mode in 2019 and the strengthening of cost management and control of funds of branches by the finance department. At the same time, the acceptance measurement of the local project in City A is 57.0251 million yuan, because the project is operated locally, the financial service advantage is obvious, and the cost is relatively low. At the same time, by summarizing the application process of information management system, the in-depth analysis of information management system is realized. Information management system has strong efficiency in economic promotion. We should actively promote the application of the system to promote the improvement of economic construction level.