Research conclusions: The sectional size and burying depth of tunnel are not the causes for deformation intrusion structure ambit, the main causes for it, unfavorable geological conditions, excavation method, auxiliary construction method, primary lining on time and feedback of information on measured data. The study shows: (1) For single track tunnel, the short benched method should be adopted with length of 10~15 meters and for double track tunnel, CRD or CD method should be adopted, or through the leading grouting and big steel tube support in advance, the short benched method should be adopted. (2) The obligate distortion amount of 5~10 cm should remain in advance to single track tunnel of the IV level rock, 10~15 cm to two track tunnel, 10~15 cm to single track tunnel of the j1 level rock, 15-20 cm to two track tunnel and 30~40 cm to tall terra stressed tunnel. (3) If the deformation speed rate is more than or equal to 5mm per day and the total accumulative deformation amount is more than or equal one-third of the obligate distortion amount, the primary lining should be reinforced, and if speed rate is more than or equal l0mm per day and the total accumulative deformation amount is more than or equal to one-third of the obligate distortion amount, the working face should be closed, supported and reinforced with radial grouting. (4) For soft rock and tall terra stressed tunnel, the integrated techniques of primary support and release and reinforcement and lining should be adopted. (5) For intrude structure ambit of the tunnel, first grouting can be conducted to the intrude structure ambit and then the steel frame should be exchanged.