The utility model discloses a be applicable to the triangle -shaped steel truss bridge of limb is divided to Y shape below the span 200m, including one and two truss no. 2 of a truss, one end and two bridge girders that truss no. 2 crosses and constitutes in some back of truss no. 1, the junction of one and two truss no. 2 of truss is the high highest point in purlin of bridge girder, the bridge girder wholly is a tripod on the space, bridge girder plane is the Y font, two trusss no. 2 splice into the main couple that is the V -arrangement in the bridge girder of Y font and divide the limb part, this kind of bridge type wholly is a tripod molding, the plane molding is the Y font and divides the limb, the facade molding is triangle -shaped's steel longeron modification, this kind of bridge type is under the prerequisite of guaranteeing great leap ability, and the following thickness of bridge floor is little, and the stiffness is big, and anti -wind anti -seismic performance is good, and its novel structure beautifully can regard as city terrestrial reference building simultaneously.