It is the primary work in bridge design to first select a suitable location for a bridge crossing rivers according to route planning, transportation functions and construction conditions, and then determine the preliminary design for bridge type. The selection of a bridge location influences directly on the basic characteristics of a bridge, such as structural function, safety, service life, technical and economical rationality, convenience of construction and maintenance and so on. The location of a bridge should be considered based on the influential factors like overall alignment of transportation route, hydrogeological conditions, surrounding radiation range, and long-term social and economical development.