It is well known that the inhibitor efficiency is encumbered by many variables such as temperature pressure pH flow speed and chemical composition of the production fluid. Salt content of formation water varies dependent on the location. Sometimes the salinity shows more than 10% by weight.The performance of several corrosion inhibitors was evaluated with an electrochemical measurement namely Liner Polarization Resistance (LPR) and weight loss coupons in autoclaves. Test solution was synthetic brines with Total Dissolved Solids (TDS) up to 17% by weight NaCl in this study. The test solution was aerated with CO2 at ambient temperature and pressure before testing between 60 and 100ºC.The inhibitors evaluated here had the temperature tolerance up to 100ºC. Corrosion inhibitors performed at low temperature better than high temperature condition. But some of them showed poor inhibitor efficiency in case of pre-corrosion with high salinity at high temperature condition. This study also confirmed the validity of ILSS (Inhibitor Likelihood Success Score) introduced by Crossland et al. and provided a useful information for inhibitor selection for pipelines in various field conditions.Several set up with/without pre-corrosion step was done to confirm the associated impact of corrosion testing procedure on the overall performance of the corrosion inhibitors. It seems that high salinity affects the inhibitor absorption competing with corrosion product. The pre-corrosion test is required step for a qualification of corrosion inhibitors for a high salinity field.