Effectiveness-based system development is an essential technology developing concept advanced by some countries,such as the U.S.A.Making use of Analytic Hierarchy Process,this paper brings forward a methodology for orbital optimization based on effectiveness in the case of the orbital deployment for the Servicing Spacecraft(SSC),which needs to accomplish many types of tasks and whose orbit is affected by kinds of factors with contradictions in orbital parameter selection.Firstly,the possible tasks of SSC are decomposed and their degrees of importance are given by the times,probabilities,values of their applications.Then,the supporting capabilities are discussed from the viewpoint of orbit design,and the determination of their weights is put forward.Finally,the relationships between the orbital parameters and the effectiveness are established by using effective function,and three synthesizing methods for a single task and its capabilities are presented. Effectiveness-based system development is an essential technology developing concept advanced by some countries, such as the USAMaking use of Analytic Hierarchy Process, this paper brings forward a methodology for orbital optimization based on effectiveness in the case of the orbital deployment for the Servicing Spacecraft (SSC), which needs to accomplish many types of tasks and whose orbit is affected by kinds of factors with contradictions in orbital parameter selection. Firstly, the possible tasks of SSC are decomposed and their degrees of importance are given by the times, probabilities, values ​​of their applications.Then, the supporting capabilities are discussed from the viewpoint of orbit design, and the determination of their weights is put forward. Finally, the relationships between the orbital parameters and the effectiveness are established by using effective function, and three synthesizing methods for a single task and its capabilities are presented.