I Abstract Study of the SPGD Controller Platform of the AO System based on FPGA Zhang Chao(Mechatronic Engineering) Directed by Prof. Li Hong-wen Abstract On the imaging observations of astronomical object, atmospheric turbulence causes the wave phase distortion, and can lead to serious phase degradation, which brings great difficulties to the imaging. The adaptive optics system is correcting the static and dynamic wave front aberration, through the real-time and automatic improvement of light wave front quality. The stochastic parallel gradient descent (Stochastic Parallel Gradient Descent: SPGD) algorithm is a new optimization algorithm developed in recent years, by applying the stochastic disturbance on all variables to measure the estimates of gradient for each variables. It does not depend on the wave front aberration d