The modification of cordierite honeycomb ceramics surface by acid corrosion and coating method was mainly studied in this paper.The cordierite honeycomb ceramics carrier surface modification effect was detected by BET,SEM,XRD and EDS,respectively.The results showed that the cordierite honeycomb ceramics coating modified alumina sol after 800 ℃ calcination was beneficial to increase the quantity of cordierite honeycomb ceramics mesoporous，so as to improve the surface performance of cordierite honeycomb ceramics.