The inhibition efficiency (IE) of Malic acid -Zn 2+ system in controlling corrosion of mild steel in S imulated Concrete Pore Solution (SCPS) prepared in well water in the absence and presence of Zn 2+ has been investigated by weight loss study. It is observed that the formulation co nsisting of 250 ppm of Malic acid and 50 ppm of Zn 2+ provides 81% of inhibition efficiency. Inhibition was found to i ncreases with an increasing concentration of Zn 2+. Polarization study confirms the formation of a protective film o n the metal surface. AC impedance spectra also reve aled that a protective film formed on the metal surface. The re sults obtained show that the Malic acid could serve as an effective inhibitor for the corrosion of mild steel in Simulated Concrete Pore Solution .