With regard to the disadvantages of financial reimbursement which used paper in corporations, this paper designs and implements an online reimbursement system. This system uses the most advanced middleware product EOS, and exactly follows the MVC design-concept for J2EE framework. It implements the business logic of financial reimbursement system. The use of this system improves the efficiency of the financial reimbursement, and upgrades the management efficiency and ability of the corporate. It has really achieved the sharing and integration of data.