Inventory redemption is an important part of inventory pledging financing business. The different redemption modes will have great impact on the financing cost of financing enterprises. This paper considers that the total cost of inventory redemption consists of the transportation cost, the storage cost and the interest cost. The paper respectively establishes the total cost function about three kinds of inventory redemption mode such as a one-time redemption at the end of the credit period, partial redemption during the credit period and advance redemption during the credit period, and derives the optimal expression of redemption quantity and batch number for each redemption mode. The paper compares the total cost of three kinds of redemption mode according to a simulation example. The result shows that the mode of advance redemption during the credit period is optimal. The sensitivity analysis of related parameters gives the effect of the total cost of the three kinds of redemption mode.