Abstract: Foam stability is one of the key factors that influence the effect of foam flooding.This paper analyzes the factors that influence the foam stability by testing the foam entrainment capability,the dynamic surface tension,the viscoelasticity,the half life period,and the foaming capacity.The factors that affect the stability of the foam system are confirmed.A tubular model is utilized to test the regeneration capability of the foaming system within porous medium so as to research the relationship between the regeneration capability and the foam stability.Results show that the viscoelasticity is in linear relationship with the foam stability but there is no corresponding relationship between the foam stability and the foam regeneration capability.The regeneration capability of foam within porous medium is the primacy key factor affecting the foam flooding effect.The foam regeneration capability within porous medium and the foam stability must be taken into account to select foaming agent for foam flooding.