Abstract: Josephson junction arrays have been thoroughly investigated as oscillators in the submillimeter wave regions in this paper. The basic principles of the Josephson junction arrays oscillators are discussed. According to these principles, the models of the oscillators and the results of numerical perturbation simulations are acquired. The simulation result shows that the junctions in the 2D array can mutually phase locked in a considerable area if the parameters can be carefully selected. This is essentially important for the successful applicabilities.