Abstract: Mission planning & scheduling of tracking and data relay satellite system(TDRSS),which to support task plan making of TDRSS scientifically,was a main content of space resource management.One of the most important characteristics of single access link scheduling of TDRSS lies in that there was time windows constraint between tracking and data relay satellite(TDRS) and user spacecraft. Tasks could only be completed within the given time windows.The scheduling model was formulated based on reasonable assumptions and constraint programming method.The model was solved with genetic algorithm based on path representation of valid genes.On the basis of a limited experiment,it is obseroed that the algorithm was very effective in obtaining near-optimal solutions.