Shimen police station. Poly Xiyue is located in the core of Guangzhou Great Health City. Guangzhou Great Health City has four functional areas: medical research and development, vocational education, health service and health preservation. Poly Xiyue in Baiyun District of Guangzhou belongs to Shimen Police Station. Baiyun District is located in the north-central part of Guangzhou, bordering Zengcheng District, Huangpu District and Tianhe District in the east, Nanhai District of Foshan City in the west and Huadu District and Conghua District in the north.