Abstract: The basic nitrogen compounds were extracted by hydrochloric acid and alcohol from CGO. Then the types and structures of basic nitrogen species in CGO and its hydrochloric extract were characterized by Electrospray Ionization (ESI) Fourier Transform Ion Cyclotron Resonance Mass Spectrometry (FT-ICR MS), and the catalytic cracking performance of the basic nitrogen compounds was studied. The data indicate that N1 type basic nitrogen compounds are dominant in CGO and these species are mainly derivatives of quinoline and benzoquinoline with alkyl and cycloalkyl chains. Under the conditions of FCC, the basic nitrogen compounds extracted from CGO still have certain catalytic cracking ability; however, the conversion is relatively low. The bond-breakages of alkyl side-chains, cycloalkyl side-chains and biphenyl bridge are the main reaction. High content of basic nitrogen compounds and polycyclic aromatic hydrocarbons are the key factors that lead to lower conversion and poorer products distribution.