In order to prepare activated alumina catalyst carrier with efficient chemical catalytic reaction and complex fine structure, we prepared a low viscosity, high uniformity and high solid content stereolithographic slurry. Effects of resin ratio and coupling agent modification on the particle size distribution of activated alumina and the stability, uniformity and rheological properties of slurry were studied by particle size analysis and rheological test. When w(HEA) : w(HDDA) : w(TMPTA) : w(modified-EA)=1.5 : 1.0 : 2.5 : 5.0, the viscosity of premix at shear rate 1 s ^-1 is only 0.35 Pa·s. After powder modification, KH560 polymer chain attached to surface of activated alumina, changing the activated alumina from hydrophilic to hydrophobic, which improved the uniformity and stability of slurry, caused steric hydration between powders and reduced powder agglomeration, leading the average diameter of activated alumina being decreased from 4.43 μm to 3.89 μm. Slurry with solid content of 52% (in mass) was prepared by wetting mixing method and then successfully printed. Debounded and sintered activated alumina samples maintains a complex irregular thin-walled structure, and their porosity and density are 51.3% and 1.93 g/cm³, respectively.