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Clay is a type of soil with high pore water characteristics which causes its problem for pavment. Ujung Kulon national Park road in Sumur Subdistrict, Pandeglang Regency is a road with clay soil type, so the road is often demaged. To overcome this its problem it is necessary to add strength and improve its bearing capacity. One of the way is by doing a method of Stabilitation on the soil in that location. The addition fly ash and carbide waste is one of the effective ways to stabilize clay soil, since fly ash and carbide waste have properties that are able to bind the soil to solid and increase the value of the soil strength. The research aims to determine the classification of soil, soil plasticity index, and find out the effect of adding fly ash and carbide waste to the soil physical properties, as well as to find out the value of the soil compression strength in existing condition and after mixing fly ash and carbide waste.The water content of the sample taken from the compaction of the original soil standart proctor. The variation of fly ash mixture that used is 0% and 20% and carbide waste with a mixture of 0%, 5%, 10%, 15%, 20% and 25%. Based on the result, the soil which stabilized by fly ash and carbide waste in the variation of 0%, 10%, 15%, and 20% showed the increase of the value of the soil bearing capacity, and decrease the velue of soil plasticity index.the largest of UCT (Unconfined Compression Ssrenght) value result for soil sample mixed with 20% fly ash and 20% carbide waste contain by curing for 28 days in amount of 5,51 kg /cm2. Curing effect on the compressive strength for fly ash has pozzolanic properties that is like cement takes time to strengthen binding and carbide waste has the cemichal compound needed by clay in the particle binding process.