The utility model provides a novel type right system long-short shaped combined bridge consisting of four independent bifurcated bridges in the shape of Bu (a Chinese character). The combined bridge is in a combined structure which is composed of four independent bifurcate arc bridges and enables crossroads to be uncrowded. Each bifurcated arch bridge is provided with a straight-going arc bridge and a left-turn bridge, the left-turn bridge locates on the left side of the straight-going arc bridge, the left-turn bridge is separated from the straight-going bridge from the left-turn side thereof so as to form a bifurcate bridge in the shape of Bu (a Chinese character), and four bifurcate arc bridges are formed into four synclastically-bifurcate bridges in the shape of Bu (a Chinese character); and two synclastically-bifurcate bridges in the shape of Bu (a Chinese character) are formed into a branch combined bridge, and the one-way sections of two straight-going bridges of two branch combined bridges are formed into a three-dimensional cross structure. The combined bridge has the advantages that the degree of hazard (caused by local geological accidents) to the whole combined tunnel is reduced; and the left-turn bridge can be used as a left-turn/right-turn shared bridge and has a wider bridge floor as a merged lane section, therefore, the situation of traffic congestion is not easily caused, and the vehicles can directly turn left without redundant detouring, so that a small crossroad of a dual 6-lane can be completely interchanged.