Network applications in Software-Defined Network (SDN) are always required to implement several functions to meet the network service demands

but how to arrange the function modules running on SDN controller to achieve multiple function packet processing is a problem to be solved.To compose the network functions

we introduced parallel and sequential composition schemes based on multiple tables;secondly

we put forward functional composition algorithms that can adapt with any multiple-table openflow switches;finally

we devised and implemented a Ryu-based control module which is used to do the function composition.Experimental results show that the method can reduce the storage cost and processing delay effectively compared with the existing schemes.