In order to make the spatial light modulator generate the reconstructed image with large depth of field in real time, the GS algorithm is used to calculate the hologram under different parameters in this paper.The reconstructed images under different Fourier holograms are obtained through the simulation of computational holographic reconstruction algorithm. In the case of no Fourier transform lens, the Fourier holograms under different parameters are output to the spatial light modulator by using a computer, and through analyzing 2D real-time dynamic display reproduction image, the conclusion shows that when the number of sampling points of the Fourier hologram is 1 024×768 and the sampling interval is 18 μm, the depth of field of the reconstructed image is 275 cm, and the depth of field of the reconstructed image is the largest under this parameter. The experimental results of Fourier hologram reconstruction with different parameters show that the smaller the phase image element size is, the larger the reconstructed image depth of field is, and the reconstructed image depth of field with Fourier transform lens is smaller than that without Fourier transform lens of the same parameter.