In order to further solve the problem of freight airport gate assignment and improve the efficiency of airport operation support， considering the double sorting centers and cargo emergency degree， a multi-objective optimization model is established to minimize the aircraft taxiing time and off-board transportation time， and to maximize the matching degree between flight type and stand type， and runway robustness. The linear weighting method is used to assign the objective function， and the distribution results under different weights are analyzed comprehensively to get the optimal scheme. With the help of CPLEX Studio IDE 12.8.0， Ezhou Airport is taken as an example to solve the problem. The experimental results show that compared with the greedy heuristic method， the gate assignment scheme of the model proposed in this paper can reduce the aircraft taxiing time by 17.90%， reduce the cargo transportation time by 6.96%， enhance the utilization rate of aircraft stand type by 21.21%， and the runway usage is completely balanced. Therefore， it improves the transit efficiency of hub airport and the efficiency of operation support， and can be used in the actual operation of freight hub airport.