In the past, the level of e-office was not that high. Before 202 1, financial bills in most parts of the country were in paper form, so it was very inconvenient for general billing units to save a lot of bill information. Now the continuous upgrading of big data storage has met the demand of financial electronic ticket reimbursement, which not only facilitates the work of financial personnel, but also facilitates the inquiry and management of ordinary people, and is not easy to lose.