Aiming at problem of resource allocation in orthogonal frequency division multiple access（ OFDMA）systems in aviation communication environment is investigated

in order to maximize the sum of utility of all users under constraint of channel resource

a time frequency joint resource allocation algorithm based on particle swarm optimization（ PSO） is proposed. The algorithm uses discrete variable to encode particle position

and new updating algorithm of particle velocity and particle positions based on probability information are constructed for discrete space. Simulation results show that the proposed algorithm is superior to existing algorithms sum of utility and fairness.