In this paper, a speckle imaging method based on phase diversity is proposed by using SLM. The aperture function of the imaging system is changed by SLM, the corresponding speckle pattern and aperture function changes are recorded every time, then the hidden target image is reconstructed by using maximum likelihood estimation and quasi Newton algorithm. The numerical simulation results show that the method of using spatial light modulator to change the aperture function of the uncorrelated imaging system, compared with the previous method of changing the camera position, can improve the image quality degradation caused by the camera position movement.