Abstract: Objective To analyze the causes of errors in medical cost account and their countermeasures. Methods Medical cost management, medical orders and preserved nurse-checked medical orders in 23 department of a certain Chinese PLA hospital from 2008 to 2009 were analyzed. Results The reduced number of errors in medical orders was 683 in 2009 compared with 2008. The reduced medical cost account was 956-thousand yuan RMB compared with 2008. Conclusion Errors in medical cost account can be effectively reduced by improving medical cost management system software, strengthening responsibility of medical staff, and perfecting training methods.