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The presence of toxic heavy metals in industrial wastewaters and its discharge into the sewage system is one of the most environmental problems. In this research, electrocoagulation method was used to remove cadmium as a toxic heavy metal from aqueous phase. The important parameters wich affect the removal of cadmium from wastewater such as the electrode type, area of the electrode, distance between electrodes, voltage, intial concentreation of cadmium and the pH were examined.  Six electrodes with aluminum and iron types were employed with the areas of 2352, 3360, 4200 cm2. The distance between electrodes  were chosen to be 1, 2, 3 cm, respectively. The experimental results indicated that optimum condition was obtained with high surface area of the electrodes of 4200, distance of 1cm, entrance power of 185, residence of time of 40 minutes and pH of enfluent of 10.25. Results showed that change in initial cadmium concentration reduced its removel.