Abstract: The wormhole zone is considered as a dual-media system and a model is proposed by considering the effect of the wormhole. The bottomhole pressure can be solved by combining the mathematical model of flow through dual media with the fracture flow model, the linear flow in formation and the pseudo radial flow model. So a deliverability equation of acid fracturing wells considering the effect of wormhole is established. The dimensionless time and dimensionless flow conductivity of different flow stages are analyzed. The results show that the wormhole zone exerts great impact on the acid-fracturing deliverability of low-permeability reservoir.