Abstract: When standard PSO used in asymmetric sidelobe pattern synthesis of linear array, the problems of convergence slow and early-maturing always encountered. To cope with these, a new method to change the initial values of PSO is provided in this paper. The method first gets continuous aperture distribution using fixed Taylor method, then discretizing the continuous by sampling. These sampling values can be used in initializing the population of PSO algorithm. During the process of iteration, tournament selection mechanism is used. Two examples to illustrate the practicability of this method are provided.And through repeated calculation, the results show that the method is high effectiveness.