Abstract: ThetasksplanningmethodofTDRSinapplicationondemandmodelwasstudied.Thecommondescriptivecharacteristicsoftaskweresummarizedanddividedintobasicandadditionalcharacteristics.Theplanningprocessandthestatechangeprocessoftaskinasynchronousresourceavailperiodwasanalyzed.Theclassificationmethodoftasktypeandtheconstructedmethodoftasksetswasproposed.Themainconstraintconditionsoftaskplanningweregiven,andtheoptimalobjectsfromapplicantandmanagerswereproposed.Ataskplanningalgorithmwasdesignedbasedontheriskaversionrule,aftertheconflictdetectionmodelandopportunityevaluationmodelwereconstructed.

Key words: tracking and data relay satellite, taskprogramming, applicationondemand, riskaversion, algorithm