Openflow is one of the most key core technologies in the existing Software Defined Network（SDN）systems.In view of the possible resource shortage in the existing SDN technology

this paper proposes a resource-reuse-based Openflow flow table storage optimization scheme involving the operation of the Openflow flow table in SDN.On the basis of the existing Openflow v1.3.1

it defines a new table structure

proposes an algorithm for computing the correlation degree of the flow table and designs a new procedure for its updating.The experimental results show that this scheme optimizes the information storage of the table entries

efficiently utilizes the available hardware resource

thereby storing more table entries under the same hardware conditions.