Guo's service customers

Large state-owned enterprises: China Petrochemical Group, State Grid Corporation, China Sinochem Corporation, China Aerospace Science and Industry Corporation, China State Construction Engineering Corporation, Shougang Group's large private enterprises: Beijing Jinglian Zheng Tai Electromechanical Equipment Sales Co., Ltd., Huali Group Co., Ltd., China Xuyang Coal Chemical Industry Group Co., Ltd., Hedong Energy Holdings Co., Ltd., Ciming Health Examination Management Group Co., Ltd., Beijing Zhongfu Telecom Equipment Co., Ltd., a listed company, Foreign-funded and multinational companies: China Bluestar (Group) Company, Armstrong Machinery (China) Co., Ltd., Beijing Jingkelong Commercial Group Co., Ltd., China Resources Land Co., Ltd., governments and institutions: Ministry of Industry and Information Technology of the People's Republic of China, State-owned Assets Supervision and Administration Commission of Beijing Municipal People's Government, Tsinghua University, Chaoyang District Government of Beijing, Yanqing County Government of Beijing.