Al2O3 and Y2O3 have been respectively chosen for additional dopants to investigate the influence on the ferromagnetism of Co doped CeO2 bulk. Results indicate that ferromagnetism (FM) of Co doped CeO2 decrease with additional Al3+. Accordingly, certain amount of Y3+ can readily be incorporated into the lattice of CeO2 with the decrease of its grain size as well as some pores formation, leading to an enhancement of FM with a positive correlation between magnetization and Y3+ doping content. This experimental result is helpful both in understanding FM origination in diluted magnetic oxide (DMO) as well as to improve the moments of DMO applicable in spintronic devices.