Using typical chlorobenzenes 1,2,3-trichlorobenzene (1,2,3-TCB) as the target removal, experiments were done for the adsorption and photocatalytic degradation synergistic reaction of Multi-walled Carbon Nanotubes of TiO2 (MWNTs/TiO2). The results showed a calculated curve that superimposed in the removal rate of 1,2,3-TCB adsorbed on MWNTs and the degradation rate of the nano-TiO2 for 1,2,3-TCB was always below the curve of 1,2,3-TCB removal rate through the adsorption and photocatalytic degradation synergistic reaction of MWNTs/TiO2 in conditions of different solution temperatures, pH, dosages of MWNTs/TiO2, and the intensity of UV light, which has fully reflected that MWNTs/TiO2 has adsorption and photodegradation synergistic reaction. The solution temperature or pH values decrease will help MWNTs/TiO2 to remove 1,2,3-TCB, increase the dosage of MWNTs/TiO2, or the intensity of UV light will help MWNTs/TiO2 to remove 1,2,3 - TCB.