In view of emulsified oil on the market had corrosion on the galvanized layer, through the immersion corrosion test of the modified emulsified oil on galvanized layer, the corrosion level of the sample after adding corrosion inhibitors on the galvanized layer was observed, a variety of corrosion inhibitors were screened, the corrosion-inhibiting additives ,which effectively prevented the corrosion of the galvanized layer and ensure other performances, were selected, a new modified emulsified oil ,which had corrosion inhibition effect on the galvanized layer ,was developed .Through the assessment of all performance indexes of the modified products, the products matched with the requirements in MT76-2011 "hydraulic support emulsified oil, concentrated liquid and its hydraulic fluid with high water content", and have achieved good application effects.