In this study, effect of process on the production of cordierite mullite composite was studied. For this reason two different processing methods were used in the production of cordierite mullite composites. In first process, in situ cordierite mullite composites were produced from cordierite and mullite layers which were formed by using aqueous tape casting method. In second one, composite was produced by addition of pre-produced mullite powders (in different weight percents, 0-30) into cordierite starting powders. The results show that the addition of pre-sintered mullite powders to the cordierite slip has more effect on densification behavior and mechanical properties of composites than layered production method. (C) 2009 Elsevier Ltd and Techna Group S.r.l. All rights reserved.