Combined with the construction of Congo (Brazzaville) Highway 2, and based on the geotechnical test of natural laterite gravel, a research has been conducted on the influence of cement permeability on the bearing capacity of laterite gravel in the form of laboratory tests with different content of cement stabilized laterite gravel, thus obtaining the optimum cement proportion of cement modified clay gravel. Then a field test has been carried out of the cement stabilized laterite gravel pavement based on its feasibility and construction requirements. The research results show that compaction work, compactness, cement content and water content have obvious effects on CBR of laterite gravel. With the increase of cement proportion and compaction degree, the CBR value of stabilized soil tends to increase as well. The real-time CBR value of heavy impact is higher than that of light compaction with the same cement proportion and at the same compaction degree. When the moisture content is higher than the optimum moisture content, the CBR value of soil sample decreases. After a proper roller compaction and maintenance, the stabilized laterite gravel with 4% of cement proportion can meet the requirements for the base of highway 2 in Congo (Brazzaville).