Abstract: We present an algorithm for producing conjugation field using two deformable mirrors. The algorithm is demonstrated effective by simulations using a Gaussian beam as the source. The simulations shows that the smooth surface of deformable mirrors eliminates the the local phase fluctuations on the first mirror, evidently improving the intensity pattern on the second mirror, and that for a Gaussian beam, the needed phase plane is very easy to be constructed by deformable mirrors. The effects of the distance between the mirrors is also discussed. Finally, we point out how to improve the present algorithm.