Asphalt pavement mostly has a structure of a surface layer of asphalt mixture and a base layer of cement bound granular mixtures（CBGM）. However，underdeveloped regions overseas are often without stable material supply and unable to build CBGM batching plants by themselves and maintain the quality and progress of CBGM construction. A suitable substitute material for CBGM needs to be chosen to tackle this problem. A graded granular material is adopted as the substitute material after a comprehensive analysis of factors such as adaptability and raw material availability，and the conversion factor is analyzed properly to optimize the thickness of the graded granular material layer. In this way，construction difficulties and risks can be significantly reduced，and quality，progress，and cost of construction can be controlled. This paper，taking a port project in South Asia that adopts a pavement structure of asphalt and the graded granular material as an example，describes the application of such pavement structure in underdeveloped regions overseas. According to the implementation result，the graded granular material has a good capacity of compaction，no cracking or rutting is observed on the asphalt surface，and no observable differential settlement of the road occurs.