通过理论分析和实验验证，证实冶金熔体泡沫演化过程中存在由球状泡沫到多面体泡沫的转型．泡沫转型前的演化速率可由伽利略数Ｇａ定性判断，而泡沫转型后的多面体泡沫破灭阶段，可以用量纲为一的因子Ｓａ来定性判断．应用泡沫转型理论，解释了冶金熔体与常温溶液泡沫衰减过程机理的差异，也给出了内生气源更容易发泡的原因． Through theoretical analysis and experimental verification, the transition from spherical foam to polyhedral foam in the evolution of metallurgical melt foam is confirmed. The rate of evolution before the foam transition can be determined qualitatively by the Galilean number Ga, and the bubble-breaking phase after the foam transition can be qualitatively judged by the factor Sa of dimension one. The foam transition theory is applied to explain the difference between the mechanism of the foam decay process of the metallurgical melt and the solution at room temperature. The reason why the endogenous gas source is more foaming is also given.