Research conclusions: ( 1) Flexible bent pile pier is composed of single - row or double - row reinforced concrete pile and reinforced concrete cover beam through connections with the main features of transferring the level force (temperature effect and braking force ) from the top structure to every flexible pier of the bridge and rationa allocating the temperature effect and braking force in accordance with rigidity coefficient. (2) From the calculations of the typical bridge, it is found that the uneven level distribution coefficient of overhead bridge for light rail is larger than that of railway bridge, so more attention should be paid to it.