Abstract: The nitrogen distribution in products during catalytic cracking of coker gas oil (CGO) was investigated in a laboratory twostaged riser catalytic cracking (TSRFCC) experimental unit with Kelamayi CGO as feedstock. The results showed that operation parameters, such as reaction temperature, catalystoil ratio and residence time, all could significantly affect the nitrogen distribution in the products. The nitrogen in the gas product and gasoline fractions decreased with the increase of reaction temperature and/or residence time, which could promote the thermal cracking. However, the nitrogen in gas product and gasoline fractions increased with the increase of catalystoil ratio, which could mainly enhance the catalytic cracking. On the whole, after CGO conversion, about 50% of the total nitrogen could produce nitrogen-containing coke over catalyst, and 20% of the total nitrogen remained in heavy oil, while only a little of the total nitrogen could be transfered into diesel, gasoline and gas products.