This research includes the influence of adding super plasticizer called (Technoplast R) which available in the Libyan market. To understanding its effect on the properties of concrete in the fresh state such as workability, and in the hardened state such as compressive strength. Four concrete mixes were designed with specific water/cement ratios ( 0.55, 0.60, 0.65, 0.70 ) without additives. Four concrete mixes were then designed with the addition of a material (Technoplast R) to the same previous mixtures at a rate of 1.5% of the weight of the cement from the Arab Union Factory and the Labda Factory, as shown in the practical testing program. The properties of these mixtures were then studied in there fresh and hardened states, as shown in the results. A set of conclusions was then obtained. Indicating that the ideal water/cement ratio is (0.55)................. Keywords:................Concrete Mixture, Slump Test, Compressive Strength, TechnoplastR, Super Plasticizer, Workability, Water Cement Ratio.