The earliest subway is usually around six o&;clock. The subway will open at six o&;clock in the morning to receive passengers. In fact, Huadu subway is similar to the subway in downtown Guangzhou. It starts early in the morning, and the last bus is generally around 11: 30 in the evening. The first line of Guangzhou Metro is Guangzhou Metro Line 1, which was officially opened on June 28, 1997. The opening of Guangzhou Metro Line 1 has made Guangzhou the fourth big city in the mainland with a subway.