In the view of theory, double bargain is related with the change of rights over things, the obligation contract, the redress of wrongs, and other questionable basic theories, which should be made clear. 自理论层面观之,双重买卖涉及物权变动、债权契约、第三人侵害债权、损害赔偿、特定物债权撤销权等一些有争议的基本理论问题,这些问题也须要厘清。