Abstract: The effects of different surface treatments on corrosion resistance and coating adhesion of low magnetic stainless steel substrate were studied. The protective coating system of low magnetic stainless steel substrate was determined by electrochemical impedance and cathodic stripping resistance test. The results showed that sand blasting with brown corundum as abrasive could not only improve the surface roughness of the substrate, met the requirements of high adhesion coating, but also reduced the electrochemical corrosion of the substrate caused by residual particles on the substrate surface. The protective coating system with epoxy zinc yellow as the bottom layer could form a dense oxide film on the surface of stainless steel, which could greatly prevent the erosion under the film and increased the corrosion resistance of the coating several times.