Taking a long-span bowstring arch bridge as the background, the reverse camber, arch axis and rise span ration of bowstring arch bridge are used for the parametric analysis. The stress of arch bridge under the different reverse cambers of arch rib, the selection of reasonable arch axis and the influence of the different rise span rations on structure stress are specially discussed. The analysis result shows that the reverse camber of arch rib has the great influence on the out-plane stability of arch rib. The increase of arch rib reverse camber and the enhancement of transverse bracing line stiffness can increase the safety factors of arch rib out-plane stability. The 1/4L arch rib section is the arch rib control section. The stress on the arch rib section in the catenary scheme is the best. With the reduction of rise span ratio, the safe factor of arch rib out-plane stability reduces.