Abstract：Research purposes:With the development of society and economy，the road design and construction change quickly，and meanwhile，the more and more hub intercommunication overpasses are built． In order to know the design conception conveniently，this paper summarizes the main characteristics of hub intercommunication overpasses in the aspects of functional orientation，traffic capacity and line font，concludes the main factors to be considered in design of the hub intercommunication overpass in the aspects of the coordination between the environment and landscape and the saving land，and analyzes the design skills of three － way － cross and four － way － cross hub intercommunication overpasses by giving the example on considering of the control conditions． These experiences can provide the beneficial reference to the type selection of hub intercommunication overpass．
Research conclusions:(1) Each hub intercommunication overpasses should be designed on consideration of its main control conditions because of the different natural environments，different functional orientations and different traffic volumes in future．(2) The overpass type is optional，so the driver behavior should be considered in design．For example，the ramp exit should not be built on the left of main lane except for the three － way － cross " Y" type overpass．(3) To the overpass located on trunk highway with big traffic volume，the number of main lanes within the overpass should be consistent to give full play of them．(4) To the reconstruction projects，the existing structures should be located on the same side of new road，and the number of level should be considered comprehensively in the type selection．
Pang Xuechun，Wu Ruiqiu．Discussion on Lectotype of Flyover for Terminal of the Chengdu Second Ring Expressway － Chengdu － Wenzhou － Qiongxia Expressway ［J］．Journal of Railway Engineering Society，2010(12) : 42－46 ．
［6］ JTG D20—2006，公路路线设计规范［S］．
JTG D20—2006，Design Specification for Highway Alignment［S］．
2013, Vol. 30 
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