The experimental research on an adaptive optics (AO) close-loop system based on the linear phase retrieval (LPR) technique is proposed. The experimental system is set up with a CCD camera imaging system, a deformable mirror, and a computer with image collection card and D/A card. In the Windows system, VC program is used in the algorithm of image processing and controlling. The wavefront information measured by a high precision Hartmann-Shack (HS) wavefront sensor is used to estimate the correction performance of the AO system. The correction ability, convergence rate and stability of the above system are discussed under different distorted wavefront. The experimental results show that the proposed system can correct the small distorted static wavefront aberration successfully.