Research methods: The thoughts were brought out and the conclusion was obtained through giving the introductions to optimum design of emergence auxiliary line for construction，program of closing sections for construction，the programs of new Tuole Station opening to traffic and old station closing traffic，and making the analysis of the construction procedure.
Research results: The construction program helped my company to open the station to traffic safely 10 days ahead of time in the course of reconstruction of exiting station of emergence engineering for construction of the second line between Lhasa and Golmud，which provided a good foundation for the second line open to traffic on time.
Research conclusions: (1)It is reasonable to arrange the construction procedure by leaving 24% time on the basis of normal operation indexes when construction of the second line and reconstruction of exiting line are conducted at 3 000 m high plateau in winter and on holidays.(2)For the similar engineering，the emergency line for construction should be designed in optimum according to the principle of combining temporary with permanent.(3)In construction emergency auxiliary line for construction of similar project，the optimum design should be made for creating favorable conditions for the continuous projects in combination with the design features of track before and after the working site，and real site conditions.
2007, Vol. 24 
