Aiming at the system composed of a cross-border e-commerce enterprise and a logistics enterprise, considering the random fluctuation of exchange rate and demand, a decision model of logistics enterprise’s pledge rate during the overseas market price sensitive was established to obtain the best pledge rate when the logistics enterprise provides inventory pledge financing. The impact of tariff rate, default rate of crossborder ecommerce enterprises, exchange rate and fluctuation of overseas demand on the pledge rate of logistics enterprises were studied. The results show that the tariff rate and the default rate of crossborder ecommerce enterprises are negatively correlated with the best mortgage rate; the best pledge rate of logistics enterprises decreases with the increase of basic demand and exchange rate fluctuation in overseas market, and the more sensitive the target overseas market price is, the faster it decreases. The result can provide a reference for logistics enterprises to formulate inventory pledge financing strategy.