A phase recovery method based on sinusoidal optical grating modulation was proposed. Firstly, the complex amplitude of the optical field was modulated by two different directions sinusoidal gratings located at the spatial light modulator. Secondly, relationship between the intensity and the partial derivative of the phase was derivate. Last, the partial derivative of the phase was calculated using intensity images, and then the phase information was recovered. The simulation experiments were carried out to test the recovery ability of the method for simple images, complex images and noisy images. The results show that the proposed method could recover phase information effectively by expediently control the image motion, which applies to the calculation of the phase objects of different scales.