The Phase Diversity (PD) technique used in wavefront detection was studied. The technique utilizes the PD between the two images on the focus and defocus to estimate the wavesfront phase aberration and to restore the degraded images. A white light imaging system was designed and a experimental platform which takes a broadband white light as a source was established, then the system above was used to simulate broadband white objects and wavefront phase aberrations in infinite distances. To grab the two images of different channels only by the same camera, a right angle trapezoid prism was designed to split the light beam into two channels, which eliminates the system deviation from different cameras and suppresses the effect of noises on the image restoration. After splitting, the denoising ability of the system for white Gaussian noise has reached 10%. Moreover the experiments also demonstrate that the resolution of the restored image has increased by 19% as compared with that of a original image. These results show that the proposed method is a good mean to restore degraded images in photoelectric image systems.