Shenzhen Metro Line 4 (longhua line) is the first line in Chinese mainland that adopts BOT mode. According to the franchise agreement signed between Shenzhen Municipal Government and MTR Corporation, MTR Corporation (Shenzhen) invested in the second phase of Line 4 in the mode of "Build-Operate-Transfer" (BOT) and won the right to operate this line for 30 years. During the franchise period, the ticket revenue of the whole line belongs to the project company, and the renovation and equipment maintenance costs are borne during the operation period.