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, the subway in Huadu is similar to the subway in downtown Guangzhou. It always leaves early in the morning, and the last bus is usually 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. With the opening of Guangzhou Metro Line 1, Guangzhou has become the fourth big city with subway in the mainland.