Abstract: The traffic routing schemes, routing characteristics, applicable conditions, advantages and disadvantages of urban rail transit lines under one way blocking condition are analyzed. Taking Tianjin Metro Line 2 as an example, the organizational processes of "unilateral short routing+single track" and "bilateral short routing+single track" two schemes are analyzed. The departing time interval of single track two way train and the workload of train operators on duty under the two schemes are explored. Finally, an optimization of mixed train operation is proposed to provide reference for the on site operation management.