Stability of organic and organic solar cells(OPV)has been considered as the most important issue that needs to be solved before commercialization.Understanding the intrinsic degradation behavior of HOPVs is one of the key issues for further improving the life time of these new type of solar cells.In this presentation,we will report our latest results in studying the intrinsic degradation behavior of polymer solar cells,and especial emphases will be put on the influence of external load and thermal stress on the degradation behaviors.