The outer ring starts from Yishan Road Station, drives clockwise, and returns to Yishan Road Station after arriving at Shanghai Gymnasium Station. The inner ring starts from Yishan Road Station, drives counterclockwise, and returns to Yishan Road Station after arriving at Dongan Road Station. Shanghai Metro Line 4 is a ring road, and the outer ring starts from Yishan Road Station, drives clockwise, and returns to Yishan Road Station after arriving at Shanghai Gymnasium Station. The inner ring starts from Yishan Road Station, drives counterclockwise, and returns to Yishan Road Station after arriving at Dongan Road Station. Passengers can choose to take the inner ring or the outer ring according to their own travel direction. Pay attention to the station name and direction when transferring to avoid getting on the wrong bus. In addition, during peak hours, there will be different operating hours and frequency intervals between the inner ring and the outer ring, so passengers need to plan their travel time and route in advance. Line 4 is the only ring line of Shanghai Metro, and trains run in inner and outer ring lines. Shanghai Metro Line 4 starts from Yishan Road Station in Xuhui District and passes through many scenic spots and buildings such as Shanghai Gymnasium and Zhongshan Park. The line passes through Xuhui District, Changning District, Putuo District, Jing 'an District, Hongkou District, Yangpu District, Pudong New Area and Huangpu District, and finally returns to Yishan Road Station in Xuhui District. The last bus of Shanghai Line 4 is divided into two forms. One is the last bus of the inner and outer circles, and the other is the train that returns to Hangzhou after the inner and outer circles arrive at Yishan Road Station.