plate is in the range of 0 03 0 05 in construction the stainless steel plate is applied with grease so as to ensure the smooth slide the slideway is kept from dust and other foreign matters so as to prevent from scratching the mge plate which could otherwise influence the utilization effect in order to control the position of the center line of the steel truss girder during pushing a sliding guide groove is welded at the top of the slideway girder to restrict the lateral displacement of the sliding block 2 cable accommodating pipes are disposed in the front slideway girder in the rear slideway girder and in the interior of the rear slideway girder in an axial direction in sequence the front end of the cable accommodating pipe located inside the front slideway girder faces the horizontal continuous pushing jack 4 and the rear end thereof is in the shape of a trumpet in order to prevent the damage to the steel strand the arrangement method of the three truss continuous steel truss girder pushing device according to the present invention includes the steps of a10 providing a row of concrete upright posts at each of the front and rear sides of the pier body in a bridge direction wherein each row of concrete upright posts include three posts the upright posts and the pier body form three groups of left middle and right supporting structures in the bridge direction a20 providing a left side truss slideway girder a right side truss slideway girder and a middle truss slideway girder on the three groups of left middle and right supporting structures respectively a30 making a bridge longitudinal.