. By the end of 2020, Chinese mainland 45 cities opened 7969.7km of urban rail transit operation, and completed 17 billion 590 million passenger trips in the whole year. 57 cities completed 628.6 billion yuan of construction investment that year, and the total length of lines under construction is 6797.5 km. A total of 67 urban rail network plans have been approved and publicized. After deducting the length of the lines in operation, the total length of the approved lines under construction is 7085.5km. During the 13th Five Year Plan period, a total of 4351.7km of new lines were added; The total passenger traffic volume is 96.94 billion; The total construction investment is 2627.87 billion yuan; A new round of construction planning or planning adjustment with a total planned investment of 2978.19 billion yuan in 35 cities has been approved; The scale of operation, construction and planning lines and the amount of investment have increased by leaps and bounds, and the urban rail transit has developed rapidly and healthily.