Abstract: Complexation denitrogenation of the Liaohe coker gas oil from Liaoyang Petrochemical Company was investigated. Single factor test, orthogonal test, reaction kettle and static mixer test were carried out. The results of Single factor test and orthogonal test show that the optimal reaction temperature is 65 ℃, and the optimum volume ratio of solvent to oil (S/O) is 1%. At this conditions, the total refined nitrogen by the kettle is 1 945 μg/g and the yield is 98.36%. Besides, when the S/O ratio drops from 1% to 0.86%, the total nitrogen of refined oil increases from 1 778 μg/g to 1 998 μg/g and the yield climbs from 98.13% to 98.78% by the static mixer. The refined oil meets the quality specification of catalytic cracking blending feed.