To improve the imaging quality of Fresnel lens, a wavefront sensorless adative optics system is used to compensate the wavefront aberrations in Fresnel lens imaging system for point source.During the aberrations correction, the stochastic parallel gradient descent algorithm is adopted to optimize the image clarity evaluation function,which is converged after dozens of correction iterations. The performance of Fresnel Lens imaging system is improved notably by adaptive optics, that the efficient radius of far-field is reduced by 43%, the corresponding second moment is 0.9975 near to the theoretical limit value 1, the image clarity and the peak value of intensity are enhanced more than once, the corresponding FWHM is upto 1.2DL,and more sufficient medium frequncies are raised up in Modulation Transfer Function (MTF). The results demonstrate that the aberrations in Fresnel lens imaging system for point source is fastly and effectively compensated by the wavefront sensorless adative optics system, which is can be applied to the space telescope due to its simple implementation structure.