Electron beam was used for degradation of aqueous solutions of 2−chlorophenol (2−CP), 4−chlorophenol (4−CP), and 2,4−dichlorophenol (2,4−DCP) in this research. The effect of absorbed dose on substrate degradation, dechlorination and pH of solutions with an initial concentration of 200mg/L each and another solution containing 50mg/L each of the three solutes mixed together were investigated. The results show that increased dose leads to increased degradation of the chlorophenols, increased Cl,－, yield and decreasing pH value of the solutions. For the individual solutions containing 200mg/L of solutes, the rate of degradation and chloride ion yield was in the order of 2,4−DCP,>,4−CP,>,2−CP, while for the mixed 50mg/L solution, while 2,4−DCP still has the highest degradation rate, the degradation of 4−CP and 2−CP proceeded almost at the same rate. At a dose of 21kGy, the rate of degradation were 93.0% for 2−CP, 98.5% for 4−CP and 99.4% for 2,4−DCP (200mg/L individual solutions), and the chloride yield was 55.4%, 71.3% and 69.0% for 2−CP, 4−CP and 2,4−DCP respectively. The calculated dose required for 90% degradation of the original solute (,D,90,) are 18.0kGy (2−CP), 11.4kGy (4−CP) and 6.1kGy (2,4−DCP) for the 200mg/L solutions and 16.1kGy (2−CP), 15.6kGy (4−CP) and 12.8kGy (2,4−DCP) for the 50mg/L mixed solution.