An imaging method of spherical antenna array is proposed by analogy with the imaging method of circular scanning synthetic aperture radar. After analyzing the principle of spherical antenna array, the feasibility of direct azimuth imaging using linear frequency modulation is discussed, and the azimuth resolution of spherical antenna array is calculated. The factors affecting the azimuth resolution of spherical array imaging, such as the ratio of spherical radius to wavelength, the number of array elements and radar operating frequency are analyzed, and the simulation results are given. At the same time, according to the principle of azimuth matched filtering, a weighted method is proposed to suppress sidelobes. Finally, the imaging effects of two kinds of element distributions on spherical surface with equal angle and concentric circle are compared.