In this study, preparation of activated carbon from coconut shells for adsorption trichloroethylene in synthetic wastewater by study temperature, time were determined, phosphoric acid concentration and time in activation affecting the properties of activated carbon such as density, moisture content, ash and iodine numbers It was found that the optimum conditions was 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 phosphoric acid concentration 60 percent by volume for 120 minutes had iodine number the highest value 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 other showed that of carbon was 30 g time to absorb for 45 minutes the efficiency of highest adsorption 57.24 percent.