ump bidding is a popular phenomenon in ascending auction. Its foreign  literature was reviewed. It is found that the studies of jump bidding are focus on two points：incentive and impact on auction revenue. There are two different explanations of the incentive of jump bidding: signaling and strategic bidding or impatience. Researcher's conclusions of the influences of auction revenue are identical: auction revenue influences revenue of auctioneers negatively and does bidders positively.