Waterborne-polyurethane was prepared by using polyester polyol, toluene diisocyanate(TDI) and dimethylolpropionic acid (DMPA) as main materials. With the types of polyester polyol, molar ratio of isocyanate to hydroxyl and content of DMPA as main factors and with peel strength as assessed index, the optimum technology condition of synthesis was elected by L9(33) orthogonal experiments. It was found that the adhesion behavior on low surface energy film of BOPP is better when polyester polyol is Poly(1,4-butylene adipate) glycol, the molar ratio of isocyanate to hydroxyl is 1.3 and the content of DMPA is 10%.