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Recently, each of the multi-function card systems has been continuously expanding its function, and almost to the acme. The implementation of bank-campus multi-function card system has realized the multi-win among banks, merchant stations, card owners and schools. However, these designs are confined to the connotative expansions of the system function, not the further optimize of the system. Furthermore, it causes considerable of data deposits. The paper explores some of the data processing in the bank-campus multi-function card system. It firstly provides the planning objectives, implementing effects, and then designs E-R chart and information flow. This paper also gives some optimization designs on some of the data storage system such as fixed-data, Fixed-individual variable data, Variable data, Auxiliary information, and so on.