As the most part of Roman theaters,it was designed following models according to Vitrubius. It was composed by semicircular rows for 5.800 spectators divided into three levels: ima -22 rows and 6 doors-, media -5 rows- and summa cavea -5 rows-. As it was usual for this kind of works, the slope of hill -in this case San Albin mountain- was used to make its building easier. Its diameter is almost 96 m. long. Rows could be reached through 13 doors that communicated with vomotorium. At its center and lower part, there was an also semicircular orchestra. Its diameter was 30 m. long, with three rows of poedria reservated for Emeritan high society and divided by a small semicircular wall called "balteus". This orchestra was covered with marble. At its front vertical of podium was elevated: the frons pulpiti, composed by several right and round exedrae. Beside 13 doors to enter the rows, there were two more for the scene: they wall have vaulted walls.