SysML:A New Systems Modeling Language

SysML is a new kind of systems modeling language being studied abroad.It is a standard modeling language for systems engineering application,which includes SysML semantics and SysML representation.The background,metamodel theory,language architecture and formalism of SysMLwere introduced.More attention was paid to nine basic diagrams of SysML which are class diagram,assembly diagram,use case diagram,requirement diagram,parametric diagram,sequence diagram,activity diagram,state machine diagram and timing diagram.Finally,main characteristics and application scope of SysML were summarized.