This paper studied a supply chain option flexibility contract faced by the constraint of order budget,in which the retailer was short of order fund.Firstly,using the non-linear programming Kuhn-Tucker condition,the paper discussed the influence of retailer's order fund on the seller's purchasing decision,and gained concrete order policies according to different fund conditions.Secondly,the problem of supplier's output decision was discussed and supplier's optimal output plan was obtained.Thirdly...