Abstract: The joint optimization of subcarriers assignment, transmit power and offloading data size in Orthogonal Frequency Division Multiplexing uplink offloading computing was discussed. The optimization goal is to minimize the maximum computing delay of a task, where the objective considers the fairness of collaborative computing. It is a non-convex problem and is transformed into a maximization problem with Dinkelbach's method, firstly. Then Taylor expansion and Lagrangian dual theorem is adopted to jointly optimize subcarriers assignment, transmit power and offloading data size. Finally, the simulation results confirm the convergence and practicability of the algorithm.