This experiment studied the identification with the concentration of Alcohol with GC machine (Gas Chromatography). And the determination of caffeine from samples by using techniques HPLC (High pressure liquid chromatography). So experimenters are understanding and be able to apply the knowledge to use. Alcohol type checking machine GC will bring Retention time has against. Retention time of Ethanol standard, the determination made by the construction of Standard curve concentration compared to the floor under the graph. The value Slope to determine the concentration of Ethanol which equals 0.92 mol / L analysis by HPLC found that caffeine and pure sample value. Retention time that rate is that there is caffeine in, for example, then the concentrated standard curve found concentrated in 0.1016 mol / L.