Among traarent ceramics, Magnesium aluminate spinel has payed attention, because of its Exclusive Properties. The fabrication process of Magnesium aluminate spinel parts consists of: preparation raw materials, synthesis, shaping and sintering steps. In each step, there are many parameters improving the final spinel parts properties. Porosity is one of the important parameters that affects the light transmission of traarent ceramics. They cause light scattering, so, in the preparation process of these ceramics, some methods should be used to minimize porosity and have suitable pore distribution. Among the different shaping methods, Slip casting is a suitable shaping method because of the good pore distribution and its low cost. For slip casting of spinel powder, the 60 wt% solid load solution of water and powder was prepared and stayed on jar mill for Removing the Agglomerates.the Rheological properties of spinel powder was studied at different amounts of dispersal Dollapix CE 64. It was found that there is an optimum amount of dispersant at which the viscosity becomes minimum. The optimum value of dispersant ranges from 0.5 to 1 wt% and the optimum time for jar milling was 48 hours. Raw samples were prepared after casting the slurry and precipitation of nanoparticles. The raw density was calculated and the samples were sintered by spark plasma machine. Characterization of the final parts sintered at 1300,1400,1500 and 1600 centigrade degree showed that the samples sintered at 1400 centigrade degree have a better optical and structural properties. The main problem of the samples was the presence of carbon impurities that influenced on traarency and color. To take out the carbon impurities from structure, the samples were annealed after sintering. The optimum annealing time was 5 hours at 1200 centigrade degree. Pre-annealing of the samples also had some desirable results. By annealing them before sintering at 900 centigrade degree for 2 hours, the transmission was increased 15% at infrared area and 10% at visible wave length area. Using tantalum foil instead of graphite foil in spark plasma mechanism, didn’t have much effect on carbon contamination and discoloration of ceramic parts, but the presence of some lithium fluoride in green bodies led to carbon emission and changed the color of final parts.