This study focuses on the influence of the silica fume on sewage corrosion resistance of mortar from concrete of sewage project.On the basis of several corrosion source which is common in sewage,four corrosion solutions are designed in this experiment,including sulfate corrosion,salt corrosion,acid corrosion and microbe corrosion.Through testing the loss of mass and strength of the mortar which is put in the corrosion solution,it is found that silica fume can improve the sewage corrosion resistance of mortar to some extent.