Al2O3-Cr2O3 solid solution was prepared using nano-η-Al2O3 powder and industrial chrome green as raw materials in a molar ratio of 1∶1. The solid phase sintering was carried out at 1400 ℃, 1500 ℃ and 1600 ℃ in a reducing atmosphere using TiO2 as sintering aid. The effects of TiO2 addition on the density, linear shrinkage, phase composition, unit cell parameters, degree of interdiffusion and microstructure of Al2O3-Cr2O3 solid solution prepared from nano-η-Al2O3 were studied. The results show that the addition of TiO2 can promote the densification of Al2O3-Cr2O3 solid solution. When the temperature is 1600 ℃ and the addition amount of TiO2 is 2wt%, the maximum bulk density of the sample is 4.57 g?cm-3, and the linear shrinkage is 19.8%; the addition of TiO2 can increase the degree of interdiffusion of Al3+ and Cr3+ in Al2O3-Cr2O3 solid solution;the microstructure shows that TiO2 can make the grains of Al2O3-Cr2O3 solid solution combine more closely. The addition of TiO2 increases the grain transition from crystal fracture to transgranular fracture, and there are only a small number of pores between and within the crystal, within the experimental temperature range. When the temperature is 1600 ℃ and the additive amount of TiO2 is 2wt%, the grain size is relatively uniform, with an average grain size of about 10 μm.