Linear antenna arrays are used to optimize antenna array factor. 16 antenna arrays are used to achieve the results. Genetic algorithm is used for linear antenna array optimization by simultaneously optimizing two input parameters. It is performed on 16 element array. Reduction of SLL and nulls in desired directions are achieved in this paper. In single parameter optimization, nulls were at -55dB. It has been found that the better nulls of -62dB occurs in desirable directions when excitation amplitude and phase are optimized simultaneously.