Abstract: Particle Swarm Optimization Algorithm is a stochastic optimization technique based on swarm intelligence. Itfeatures relatively simple principal and few parameters, therefore, it’s so easy to realize that a large amount of non-linear,non-differentiable and multi-peak-value complicated problems can be solved by the technique. Firstly, the basic principle and flow ofthe Particle Swarm Optimization Algorithm are introduced in this paper, and then how to apply this method to the antenna arraypattern synthesis is studied. Finally, an application instance using PSO in the antenna array pattern synthesis is given. The workingresults indicate a fine application prospect using PSO in the antenna array pattern synthesis.