Ga-based liquid metals have gained significant attention in the field of flexible electronics due to their inherent properties such as good fluidity, high electrical and thermal conductivity, and non-toxicity. The undercooling phenomenon and oxidation behavior of these liquid metals are crucial factors influencing their stability and applicability in various environments. Under specific conditions, Ga-based liquid metals exhibit remarkable undercooling behavior, maintaining a liquid state even at temperatures far below their solidification point. They readily react with oxygen and water, leading to the formation of solid oxides, which poses challenges to their stability and functionality. This paper provides a comprehensive review of the research progress on the undercooling and oxidation properties of Ga-based liquid metals. It discusses the mechanisms behind undercooling and the formation of oxide layers, emphasizing the factors affecting their stability and controllability. Furthermore, recent advancements in mitigating undercooling and oxidation effects is explored.