Based on the analysis of network services and the deficiency in current layered network architectures caused by multi-layer functional duplication and complicated processing

this paper proposes a Service Unit based Network Architecture (SUNA).Service Unit (SU) only provides services

and does not receive any services

thus it avoids inter-layer interactions and costs of delivering services.SU provides services for local node applications

and SUs of different nodes can also collaborate to provide services for the entire network or a certain node.Furthermore

the Micro-communication Element System (MCES) is presented for SUNA

which is easy to be transitted from TCP/IP.Micro-communication System is constructed of organized Micro-communication Elements which are equal to SUs

and network system consists of many Micro-communication Systems.MCES is easy to design and implement and has greater flexibility.