Abstract: Complex electromagnetic environment is the hot research topic in the field of simulation and multi radiation sources is one of the most import ant elements.The traditional parabolic equation model should be calculated several times to get the electromagnetic informations of all radiation sources, which would cost excessive computation time.For that, a parallel programming of parabolic equation model based on Open Multi Processing (OpenMP) is proposed, which can model radio wave propagation of multi radiation sources in large computing space efficiently by making full use of the multicore computer.The numerical simulation demonstrates that the parallel programming markedly improves the computing speed and achieves high parallel computing efficiency.