In this study, preparation of activated carbon from coconut shells for adsorption trichloroethylene in synthetic wastewater by study temperature, time were determined, concentration of phosphoric acid and time in activation condition the properties of activated carbon such as density, moisture content, ash and iodine numbers It was found that the optimum conditions was temperature at 500 C 0 for 60 minutes Then activation carbon with phosphoric acid (H3PO4) in the ratio was 1:3 at concentration and time in activation different Showed that the concentration of phosphoric acid 60 percent by volume for 120 minutes it showed highest adsorption capacity iodine number to 737.7741 mg/g Then, take activated carbon to for adsorption trichloroethylene in synthetic wastewater with concentration of trichloroethylene 2476.20 ppm by volume carbon and time to absorb showed that of carbon was 30 g for absorb 45 minutes the efficiency of highest adsorption 57.24 percent.