The as-cast Al-Ga-Mg-Sn degradable aluminum alloy was microalloyed and heat treated. Al-Ga-Mg-Sn-Bi alloy was selected for annealing and solution/aging treatment. The microstructure, phase composition and self-corrosion potential of Al-Ga-Mg-Sn-Bi alloy were analyzed by optical microscope, scanning electron microscope, X-ray diffractometer and electrochemical workstation. The results show that the addition of trace Bi and Zn elements reduces the self-corrosion potential of Al-Ga-Mg-Sn; The as-cast Al-Ga-Mg-Sn-Bi alloy is composed of Al matrix phase, Mg2Sn and Mg-Ga phase, and the characteristics of fishbone dendrites are obvious At room temperature, the self-corrosion potential in 3wt.%KCl solution ranged from -1.60V to -1.49V. With the increase of annealing temperature, dendrites decrease and disappear at 500℃. Mg2Sn and Mg-Ga phases were precipitated after solution/aging treatment. Compared with the hardness of as-cast Al-Ga-Mg-Sn-Bi alloy, the hardness after annealing treatment decreases. Hardness increases after solution/aging treatment. Compared with the degradation rate of as-cast Al-Ga-Mg-Sn-Bi alloy, both solution/aging treatment and annealing treatment reduce the degradation rate.