The disadvantages of invert trestle of tunnel are many, including low construction speed, lots of construction joints and long maintaining term. The invert trestle of Jiguanshan tunnel on JilinTumenHuichun passengerdedicated railway line is designed under great difficulties, such tight construction scheme, large crosssection and strict step span. The safety coefficient of invert trestle is decided by means of structural modeling calculation. The practicability of invert trestle of tunnel is decided by means of comparison and contrast between labor arrangement and construction term of common invert trestle and that of long invert trestle. The application of the long invert trestle shows that it is successful.