Abstract: In this paper,the spatial symmetrical solar concention power generation system is taken as the research object,and the inorbit attitude of the system is planned and studied in order to realize the system’s all-weather sun-track.Firstly,the relationship of the tracking parameters and orientation of the incident light is demonstrated on bas is of The change law of the joint angle varying with time is analyzed.secondly,the system tracking light directional parameters have been derived,a kind of novel attitude planning strategy and implementation method for sun-tracking is presented,which demonstrated that attitude planning can meet on the rationality and validity of the directional conditions.