Abstract: Using Gylder-Meshcherckii equation and Eddington-Jeans law, the influence of solar mass-loss on planetary orbits is discussed in this paper. It is shown that solar mass-loss will cause the first-order secular and periodic terms in the semimajor axis a, the first-order periodic and secon-order mixed terms in the eccentricity, and the first-order periodic, second-order secular and mixed terms in the argument of perihelion of planetary orbits. The secular variation of the semimajor axis of planetary orbits should influence the stability of solar system.