Research conclusions：The maximal deformation in the vertical direction is 0. 662 mm when the train passes in the unidirectional way; it turns to 0. 775mm when the trains pass in reversible ways. The vertical deformation of the canopy truss will attach to its maximum with the downward direction under the action of other combinatorial loads which does not take the temperature in consideration. There are two aspects when the contribution of temperature is concerned: negative temperature makes the canopy shrink which increases the vertical downward deformation of the truss, while positive temperature makes the canopy expand which cancels out partial vertical downward deformation, the deformation value will reduce consequently. On the strength aspect , the maximal stress of the truss is less than the yield extreme of the material under the action of the considered load condition , so the canopy is feasible.