This paper relies on the continuous rigid frame bridge naming Laowo Bridge whose roof beams and plate beams are concurrence. The sequence of prestress drawing effect including batch and synchronization on prestress loss were analyzed by using Midas/civil finite element software through selecting typical conditions. The results show that the loss of drawing roof beams first is small than drawing plate beams. In the actual engineering, we can choose the right sequence of prestress drawing according to the scene.