Aiming at such situations as acceleration of the corrosive bured-out rate, exceptional consumption and increasingly breaking down of grate bar during sintering production after adding proportion of acid sludge in the sintering raw mix, which lead to vibration of sintering process and increase of product cost, the cause of the abnormal corrosive burned-out rate of grate bar was analyzed by means of chemical analysis, micro corrosive morphology inspection and the metallurgical microstructure analysis. The research result shows that the sulfide in the acid sludge is the main cause of the grate bar failure, and the higher carbon content in the grate bar material which leads to severe poor chromium phenomenon near the grain boundary also speeds up the corrosion of the grate bar. A series of effective measures such as no addition of acid sludge, optimization of the grate bar chemical contents, adjustment of the hearth layer height and the position of the grate bar push roller, enhancement of the maintenance of the heat insulation set, etc. have been taken to reduce the consumption of the grate bar, the breaking down times of the sintering machine for replacing the failed grate bars has been reduced to about 3 times per month, and the stabilization of the sintering process was improved.