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Soil is an important element in the base structure of highways. In certain types of soil has low capacity such as clay soil. Soil stabilization is an effort to improve soil conditions to be better based on the characteristics possessed. The characteristics that are the main parameters are CBR (California Bearing Ratio). Stabilization of the CBR values of clay can be carried out chemically. The stabilitazion way is done by mixing clay soil and Dolomite lime with variations 2%, 4%, 6% on volume of test object. In addition, ripening of test sample by different times, they are 1, 3, 5, and 7 days. From all test samples, they compare clay soil without mixing lime variation, the following will do stabilization. Based on the research, it was found that CBR value of clay soil 5.56%. After mixing 2% lime of CBR value 6,27%, 4% of mixing, Dolomite lime of CBR value 7,60% and 6% mixing, lime of CBR value 5,51%. After stabilization by Dolomite lime based on curing time. The Highest CBR Value is found on lime variation 4% with 5 days of curing time. CBR value is 8,67%