The theater is the most important public building in Rome. Among them, the most famous ones are the Theater of Forange, which was built from 44 BC to 13 BC, and the Theater of Forange, which was built in 50 AD. The auditorium of Matzerus Theatre can accommodate 1000 to 1000 people. The outer wall is divided into two layers, both of which are voucher columns, and some walls are still preserved. Now the Orange Theatre in the south of France has an upright stage, which unifies the appearance of the theatre. This theater can hold about 7000 people. It was built on a hillside, and half of the audience was built on the terrain. The basic design of the Roman theater was changed from the Greek theater. It has been pointed out that Roman theaters are generally built on flat ground, while Greek theaters use the natural slope of mountains to open up audience stands. There is more than one semicircle in the auditorium of Greek theater, but the auditorium of Roman theater is a regular semicircle, and the audience outside the semicircle is cut off because of poor visibility. The platform height of Roman theater is generally less than 5 feet, and the architectural walls on the stage are beautifully decorated. The orange theater mentioned above has three doors on the front wall and is decorated with many symmetrical columns, triangles, niches and statues. Therefore, the theater is one of the highest achievements of Roman architecture in terms of design, architecture and decoration.