Abstract：The secondary lining construction time of large-deformation tunnel in soft rock is a controversial issue in tunnelling engineering. However，the specific discriminant index for secondary lining construction time of large-deformation tunnel in soft rock is inexistent now. Based on the practice of Wushaoling tunnel，the influential factors of the stability of lining are analyzed. In addition，the relations between the primary support deformation and the lining deformation，the deformation rate of the primary support and that of the lining，and the shared ratio of secondary lining in cracked section of lining are analyzed，too. The lost displacement is estimated and the relations between the monitoring deformation，deformation rate and the limit displacement are worked out according to measured data，calculated limit displacement and elastic displacement. Finally，two distinguished indexes about the lining construction time of Wushaoling tunnel with different large-deformation grades，which is based on limit displacement and dependent on deformation each day and total deformation，are put forward.
