Research conclusions: Based on the investigation of the current conditions and the analysis of the reasons for the difficulties, the difficult problems in coordination of the Line 8 with the OTC is overcome by taking the countermeasures, getting the good results. (1) Compared with the construction planning，the track length is shortened and the project investment is saved by 2.1 billion yuan. (2) By reasonably setting up the stations, the OCT branch lines and the Line 4 can cover the surrounding areas, and it can promote the rapid development of the region. (3) The floor of the property development increases by 29,150 square meters and the commercial value of the subway is enhanced.