Argumentation-based　approach　to　negotiation,　which　allows　agents　to　exchange　additional　information　or　argue　their　beliefs　and　other　mental　attitudes　during　the　negotiation,　is　gaining　increasing　popularity　for　its　potential　ability　to　overcome　the　limitations　of　conventional　approaches.　In　this　paper,　a　mechanism　of　how　argument　gives　effect　on　the　negotiation　conceding　strategy　is　analyzed.　Furthermore,　a　time-constraint-based　conceding　strategy　is　proposed,　considering　the　impact　of　argument.　At　last,　experiment　is　designed　to　illustrate　and　verify　the　proposed　strategy,　and　the　result　demonstrates　that　argument　have　the　ability　to　improve　the　effectiveness　of　negotiation.