Id kah Mosque is a mosque located in Kaskar, Xinjiang Uyghur Autonomous Region, China. The mosque can hold up to 10,000 people, and can reach 20,000 on Friday prayer. The mosque was built in 1442 however the mosque’s modern golden-brick structure was built in 1798, replacing the older building, and was further expanded in 1838 to its current size. The mosque received a renovation in 1981, and the mosque’s façade was covered with tiles between 2004 and 2005.

The mosque incorporates architectural features observed in Central Asian, West Asian and to a lesser extent, Chinese architecture. The mosque is centred around the prayer hall and has a courtyard on both sides of it. The Id Kah Mosque consists of a chapel, a sutra hall, a gate tower and some other auxiliary buildings. The temple gate is made of yellow bricks, the gate is 4.7 meters high, 4.3 meters wide, and the gate building is about 17 meters high. Two 18-meter-high minarets are built asymmetrically on both sides of the gate tower, and a crescent moon stands on the top of the tower. At dawn each day, the imam in the temple will climb the tower five times and call for Muslims to come and worship. Behind the gate tower is a large arch, with a minaret at the top.

The building complex is in grand Islamic style, with strong religious features consisting of a gate tower, a courtyard, a doctrine-teaching hall, and a large Hall of Prayer.

As they wind through the Tower Gate, visitors see a large courtyard. The south and north sides of the courtyard are lined with 18 doctrine-teaching halls. In the courtyard, poplar trees tower high up against the blue sky, and pines and cypresses flourish. The entire yard is heavily shaded. A pool in the yard with crystal-clear water embeds the lush vegetation. The yard provides a tranquil and secluded environment for relaxing and refreshing oneself.

The Hall of Prayer is built on a high platform and it contains three parts: the Inner hall, the Outer hall, and the Hall Entrance, all which sit on a dais over one meter high over ground. The roof of the Outer Hall is supported by 140 light blue wooden pillars. These seven-meter high pillars were laid out on a grid pattern, artistically spaced. On the roof and on the pillars are exquisite carvings and beautiful pictures. The brick gate tower, which faces Id Kah Square, is full of elaborate flower-pattern carvings, mainly in green.