1, 2, 4-trichlorobenzene is a kind of organic contamination which is difficult to be decomposed by normal methods,[1-5],.1, 2, 4-trichlorobenze at initial mass concentration of 200mg/L in aqueous was irradiated with electron beam in a laboratory-scale.The irradiation was performed at room temperatures with a GJ-2-Ⅱaccelerator (Shanghai Xianfeng Motors), with 1.5MeV1mA E-beams. Practical range of the electrons is about 0.7g/cm,2,. The samples, each of 20mL with a 4mm depth, were placed at 30cm under the titanium window and scanned by the E-beams at a dose rate of 3.5kGy/s, as was determined by membrane. concentration method with GC. Doses delivered to the samples were 35, 70, 105, 140, 210 and 280kGy, respectively.