To optimize the acoustic field produced by phased array effectively and quickly, the pseudo-inverse method proposed previously is simplified. An approximate weight formula of acoustic pressure using a method of compensation to the amplitude and phase of the controlled acoustic pressure is presented in this paper. A multiple-focus field patterns based on the pseudo-inverse matrix algorithm can be obtained by presetting the value of the controlled acoustic pressure. A phased array comprised of 16 × 16 square elements is used for numerical simula...