The invention relates to a exhaust gas purification system for an internal combustion engine and a control method for the same, wherein the exhaust gas purification system for the internal combustion engine includes a NOx storage reduction catalyst, reducing agent supply means, an EGR apparatus, rich spike control means for executing a rich spike control that recovers exhaust gas purification performance of the NOx storage reduction catalyst, by controlling the reducing agent supply means so that the reducing agent supply means supplies the reducing agent to temporarily decrease an air-fuel ratio of the exhaust gas that flows into the NOx storage reduction catalyst to a predetermined target inflow air-fuel ratio, and base air-fuel ratio control means for decreasing a base air-fuel ratio in the internal combustion engine to a predetermined spike base air-fuel ratio, when the EGR apparatus recirculates the exhaust gas, and the rich spike control is executed, wherein the predetermined spike base air-fuel ratio is lower than the base air-fuel ratio when the rich spike control is not executed.