The self-adaptation logic and enterprise logic of self-adaptive systems are often tangled with together in existing approaches to engineering complex self-adaptive system

which makes it difficult and complicated to develop and maintain self-adaptive systems.We believe autonomy is the basis of self-adaptation and it is necessary to separate the self-adaptation logic and enterprise logic of self-adaptive systems in order to simplify the development of such complex systems.A Self-adaptive Agent strategy Description Language SADL is therefore designed to specify the self-adaptation of systems.Self-adaptive agent can sense the changes of the situated environment and dynamically execute self-adaptive operations such as join

quit

deactivate and activate in order to adapt to the environment changes.The paper introduces the syntax and semantics of SADL and the design and implementation of its compiler.