The opening ceremony of the Beijing 2022 Olympic Winter Games was held at the National Stadium, also known as the Bird’s Nest, on the evening of February 4, 2022, which was renovated by the China State Construction Engineering Corporation(CSCEC),making the Bird’s Nest the first "dual Olympic stadium" in the world.
The National Stadium, or the Bird's Nest, covers an renovation area of about 100,000 square meters with 37 renovation projects, among which 25 were undertaken by CSCEC, such as the renovation and repair work of the outer steel structure of the Bird's Nest, the comprehensive restoration of the rainwater harvesting system at the top of the Bird's Nest, the installation of hot & cold direct drinking water equipment in the stands, the replacement of nearly 1000 signs, and the renovation of the landscape lighting system of the Bird's Nest.