Data center is the critical data platform to the system securities and other financial institutions. The status of its network system is extremely important. During a securities firm in the implementation of data center construction process, on the basis of need a network centric design principles and construction goals, this paper describes its data center network core business network, trading and office system network and wide area networks systems design. The operation of the new network system design shows that the system meets the business needs of the system and achieves the development goals.