The main business of Shanghai Yiyuan Construction Engineering Co., Ltd. involves central air-conditioning, ventilation, refrigeration, floor heating, water supply and drainage, kitchen equipment, environmental protection, intelligence, mechanical and electrical installation and other types of construction projects in shopping malls, hotels, office buildings, factories, villas and other types of construction projects. Maintenance service. The company pays attention to the management concept of "quality" and "efficiency". For many years, the company has been operating well, without quality failure or safety accidents, and it has been well received by many customers.