Zibo Yunhe Engineering Technology Service Co., Ltd. is mainly engaged in fire maintenance. The maintenance projects include: Zibo Hotel, Zibo Vocational College, Zibo Occupational Disease Prevention and Treatment Institute, Zhangdian Chinese Medicine Hospital, China Resources Central Park and Arc de Triomphe. Fang Emerald County, China Agricultural Bank, Qitian Hotel, Wanxin Tire Factory, shandong aluminum industry Electronics and other projects have been well received by the owners.