Nowadays, with the development of the use of polymers in various industries, new methods for the production of plastic products have been devised. In the meantime, Thermoforming has a large position as a process in which the plastic sheets are re-deformed to produce the final fabricated product. One of the problems in this process is the shape of the final profile of the thermoformed workpiece, especially when this product is to be assembled with other components. At present, the prediction of the shape of the final profile without using trial and error methods, which is usually cost-effective and time-consuming, is not feasible. Therefore, in this study, the effect of different parameters on the final shape of the produced piece was investigated. On the other hand, uniform thickness distribution is another important parameter in the production of parts with this method. Because as the thickness of the piece is more uniform, the resulting strength of the produced piece will increase. Although multiple factors are affecting the final quality of the produced piece, the temperature and pressure are the most important and influential ones. Therefore, the effect of temperature and pressure on the final profile of the unit and its thickness distribution were investigated. The materials used in this research were ABS/PMMA sheets with a thickness of 3.5 mm. One of the most important uses of this materials is their use in health and decorative industries. The results of the research show that with increasing temperature and pressure, the profile will be closer to a radius of 72 millimeters. The effect of both temperature and pressure parameters on thickness distribution was also investigated. The results showed that with increasing temperature and pressure, the thickness of the piece will decrease and its unevenness will increase. Experimental observations showed that elongation is a two-axis shaping process. Process simulation was performed using the hyper-viscoelastic material model. In order to ensure the correctness and accuracy of the simulation model, the results of the predicted profile form were compared with the results of the experimental tests with the maximum error of 15%. Keywords: Thermoforming, Finite element simulation, Viscoelastic, Hyperelastic, ABS/PMMA, Thickness distribution