The reduction of dissolution of Stainless less steel 304 could be achieved by using 1, 1-Diallyl-3-(2, 3-dimethyl-6-quinoxalinyl) thiourea (DDQT) as inhibitor in 5M Na2SO4. The computational quantum mechanical analysis for inhibition performance of the compound has been studied using values of EHOMO, ELUMO, ΔE and dipole moment, mass loss, gasometric and electrochemical studies. Potential-Current Curves manifested that the inhibitor follows mixed type of inhibition in industry environment. The adsorption of inhibitor on SS 304 surface obeyed Temkin’s adsorption isotherm. © 2016 International Journal of ChemTech Research. All right reserved.