Langfang is a prefecture-level city of Hebei province located approximately midway between Beijing and Tianjin.The Grand Theatre is situated on a platform island on the west side of Dream Lake. The platform is surrounded by water from three sides. The site area is approximately 90 meters times 100 meters. We call our proposal the Musical Box. The musical box refers to an item, a case, which when opened starts playing music. We conceive this theatre to have a very similar function. During the day the building seems to be calm with all the elements inside the building frame resting peacefully. At night the interior illuminates and the theatres seem to come alive to the outside world. Functional concept is to open the building’s main direction towards the lake and to create a visual ending for the plaza on the west side.The building’s program consists of two theatres, two cinemas, a hotel, two large rehearsal rooms and all the ancillary functions for the actors, musicians, staff and the public. Offices and other functions are located around the halls.The front of the house is visually integrated in the lake space, whereas the entry side of the building is designed to act as an ending for the plaza. Nevertheless the visual connection remains on the ground floor.