Abstract: In this paper,generalized state graph method is introduced. Generalized state graph method includes two parts,one is the generalized state graph design method,another is the state-oriented process design method.Based on traditional state graph,the concept of action node is introduced.Action node is used to represent the system action in a state transform,and the relationship among multitasks.State-oriented process design method, depending on the relationship between the elements of generalized state graph and process design,produces the process design of a multitask system from a generalized state graph directly.