Considering the difficulty to precisely forecast the demand of consignor,there is large uncertainty in booking shipping slots.The liner company always requires the shipping agency to adopt the strategy of lot booking to protect its own profits.A two-stage profit model was built for the liner company and shipping agency based on the demand information updating of the market.Also,the optimal level of the centralized decision making for the slot supply quantity of the liner company and the booking quantity of the shipping agency was realized.A win-win situation for both the members in the supply chain was achieved by comparing the advantages and profits of centralized and decentralized decision making strategies and by designing an effective slot buy-back contract to coordinate the supply chain.The results by means of different models were illustrated by numerical analysis examples.