Aiming at the real-time assignment problem of multi-terminal, a real-time assignment algorithm is proposed based on the collaborative decision and the slot exchange fairness of different airlines. The algorithm can share terminal resources, use the minimum delay cost principle as the constraint, and adopt the mixed set programming to solve the assignment model. Under the perquisite of sharing multi-terminal, the method can realize the fairness of the airline time slot interchange, and minimize the cost caused by the delay. The example shows that the proposed method can effectively solve the real-time allocation problem in multi-terminal.