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The Flyash waste is a result of coal combustion which can pollute the environment. The research aims to determine (1) how the effect of the variation of the percentage of Flyash as a partial substitute for cement on the weight of the concrete load, (2) how the variation in the percentage of Flyash as a partial cement substitute for the compressive strength of concrete, and (3) how does curing variation affect (treatment) on the value of compressive strength of concrete with Flyash as a substitute for partial cement. The research was conducted in the Laboratory of Building Materials, Structures and Construction, Faculty of Architectural Engineering, University of Hasanuddin, Gowa Regency, South Sulawesi Province. The method used in this study was an experiment by making concrete from Flyash class F waste from PT. Bosowa Energi Jeneponto Regency, South Sulawesi Province. Concrete samples were made in a total of 120 pieces for two types of curing, namely dry curing and water curing, four sample variations namely 0%, 30%, 50%, and 70% Flyash, weight testing and compressive strength of the samples carried out each of the three age of 3, 7, 14, 21 and 28 days respectively. The results showed that the average weight of the lowest concrete samples was in the variation of 30% Flyash for dry curing, which was 3.45 kg, and water curing was 3.61 kg, while the highest was in the 70% variation of Flyash for dry curing, which is 4.47 kg, and water curing is 4.61 kg. Based on variations of 0%, 30%, 50%, and 70% the compressive strength of concrete declined, namely 24.84 MPa, 22.16 MPa, 11.97 MPa, and 4.20 MPa, for dry curing, and 25.73 MPa, 22.93 MPa, 12.87 MPa, and 4.97 MPa for water curing. The effect of curing variations on the compressive strength of concrete is also increasing as the curing period increases, for dry curing 3, 7, 14, 21, and 28 days, respectively 12.73 MPa, 13.33 MPa, 13.63 MPa, 15,07 MPa, and 22.16 MPa, for water curing, respectively 13.50 MPa, 14.09 MPa, 14.56 MPa, 15.84 MPa, and 22, 93 MPa.