Thin porcelain was reinforced by using Al2O3 short fibers with low aspect ratio as reinforcement. The influence of addition of Al2O3 short fibers on water absorption, bending strength of green body and sintered body, fracture work, phases and morphologies of the specimens as well as mechanism of reinforcement and toughening were studied. The results show that the optimal Al2O3 short fibers content in the raw powder mixture of porcelain is 15%(by mass), at which the water absorption of sintered body is 045%(by mass) and the bending strength of green body and sintered body is 176MPa and 8184MPa which is 62% and 1690% higher than that of porcelain matrix respectively. Especially, the fracture work of sintered body rises to 67022J/m2, which is 358% higher than that of porcelain matrix. The major phase of fiber turns from θ Al2O3 to α Al2O3 which promotes secondary mullite during sintering at 1200℃, leading to reinforcement effect. The fracture work increases significantly due to crack deflection and debonding of interface between fiber and matrix. Meanwhile, the secondary mullite and large amount of nano grain boundaries in Al2O3 short fibers also attribute to energy consumption for crack propagation.