Guo Yan's service customers

General Motors, Dongfeng Nissan, Caterpillar (China), Lixinghang Machinery, Wyeth Pharmaceuticals, United Searle, Sanjiu Medicine, Honeywell, Maiwai Trading, Dongfeng Citroen, Shanghai Siemens Switch Co., Ltd., Yanfeng Visteon Automotive Electronics Co., Ltd., Chery Automobile, Tianjin Gao Legao, Ai Ou Smith (China) Water Heater Co., Ltd., Lafarge Beijing Xingfa Cement Company, Band-Aid Pipeline System (Band-Aid). Xiahui Food (Shanghai) Co., Ltd., Dongfeng Motor Co., Ltd., Si Nuo Fashion Textile, Pacific Summit (China) Investment Co., Ltd. Biddy Medical Equipment (Shanghai) Co., Ltd., Ericsson Technical Service (China) Co., Ltd., Osram (China) Lighting Co., Ltd., Shanghai Pudong Veolia Water Supply Co., Ltd., Heineken. China Offshore Oil Group, Seagate Technology, Huawei Communication Technology Co., Ltd., Jingxin Communication, Shanghai Innovation Technology Co., Ltd., Schindler Electronics (Suzhou) Co., Ltd., Dongfang Network, Zhejiang Zhongxing Electronics Co., Ltd., Zoje Group, Guizhou Jinyuan Power Investment Co., Ltd. and other fortune 500 enterprises and successful domestic enterprises.