By studying on the different TG curves of magnesium citrate gel, which prepared by different methods, we found that combustion process occurred and the nitrate ions acted as oxidant in combustion process. 将该法制得的柠檬酸镁与溶胶凝胶法制得的前驱体的TG曲线进行比较研究,证明了自蔓延燃烧的发生,而硝酸根在自蔓延燃烧中作为氧化剂。