105 National Highway and the rebuilding project of Baichen Highway in Shunde City of Guangdong Province, the paper introduces some characteristics and experiences in the design and construction of the widening and rebuilding project of old bridge.

Taking an old bridge widening project in Xinxiang Area as an example,the article introduces in detail the whole course from the designers getting the power of attorney for design to analyzing and finally determining the design scheme,and sums up the experience and basic thinking in the widening and rebuilding of the old bridge in Xinxiang Area.

According to embankment widening of 312 national highway on soft gro un d, the observation method and control criterion of settlement and stabilization are studied in the course of widening construction.

Combined with engineering examples of Tianjing outer ring road,the paper introduced the characteristics,advantage and strengthening principal of geotechnical grating,also including procedure,quality control in widening construction etc.

Research and Analysis of Widening Alteration of Dalian Northeast Road Cloverleaf Junction;

An analysis of the innovation of the education of master s degree of engineering——A case study at Hebei university of technology;