This paper summarises and discusses the application of knowledge-based techniques to protocol engineering. First

we explain what is knowledge engineering and protocol engineering. Then

we discuss some main problems in the traditional protocol development pattern-life cycle pattern

and give the methods to solve those problems. We propose two kinds of methods for applying knowledge-based techniques to protocol engineering. That is

modification or revolution to life cycle pattern. Through the discussion

we point out: application of knowlede based techniques to protocol engineering will make the experiences of developers reusable and increase the dynamic feedback property of each development step. Consequently

the quality and efficiency of a protocol will be improved and the cost will be decreased. Moreover

this application will facilitate the maintenance of both protocol and development systems.