.By the end of 2020, 45 cities in mainland China opened 7978.19km for urban rail transit operation, and the length of new operation lines in 2020 was 1241.99km. In 13th Five-Year, five years, Chinese mainland"s new city rail transit operation lines totaled 4360 km, with an average annual opening of 872 km. In 2020, a new round of construction planning (or adjustment of planning scheme) of eight cities will be approved and publicized. The approved projects involve 587.95 km of newly added urban rail transit lines, with a total investment of 470.986 billion yuan. During the 13th five year plan, the national development and Reform Commission has approved the new round of urban rail transit construction planning or adjustment of construction planning, involving a total of 4001.74 km, with a total planned investment of 29781.91 billion yuan.