| In recent years, with the rapid development of economic construction in our country, high-grade highway construction is evolving with unexampled speed. Because of the large population and the scarcity of the soil resource in today's China, We can foresee: the widening and rebuilding of highway is very important matter that we must account for at the beginning of the new century. China is now just in the early stage of widening and rebuilding of high-grade highway, hence no detailed design and construction specification can be found within the mainland of China. In comparison with the highway to be constructed, the project of widening and rebuilding is characterized by the following features: difficult and tough construction techniques and high-quality requirements etc. The research of this technique is a new subject in our country. Therefore, it is of much importance.In the process of widening and rebuilding the used road, how to assure the new and old embankment, especially on soft ground, not occurring significantly different settlement and minimizing the deformation and crack of the pavement is a problem to be solved simultaneously. In this paper, based on the problems of the widening and rebuilding the used road, expatiates the importance of controlling different settlement of the new and old embankment, and the effects of ground, load , width and compression ratio. According to different environment, the paper also discusses the deformation characteristics and the settlement computing method of the widening embankment structure. Then, contacts with the fact in the engineering, analyzes the mechanism of geosynthetics in the widening embankment structure, moreover, through computing and analyzing the paper introduces the effects of the geosynthetics which reducing different settlement of the new and old embankment.In the end, there are some this paper's main viewpoints and recommendations on improving the research of theoretical analysis of widening the used road.
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