天津市将新建６条地铁线路，完善、延长原有地铁线路，规划工作已经完成。据介绍，轨道交通线网将采用放射型结构形式，并由两条线路构成市内不封闭的半环线。目前天津市中心地区地铁线路长度为７．４ｋｍ。２０１０年，中心城区规划地铁轨道交通线路７条，线路总长１５３．ｇ Tianjin will build 6 subway lines, improve and extend the original subway lines, planning has been completed. According to reports, the rail transit network will be used in the form of radial structure, and by the two lines constitute the city does not close the semi-circle line. At present, the length of metro line in downtown Tianjin is 7.4km. In 2010, the central city planning subway rail transit lines 7, the total length of 153 lines. g