Abstract: Column-chromatography and Soxhlet extraction methods were used to separate high-nitrogen feedstocks. The molecular structure and functional group of the isolated basic nitrogen compounds, non-basic nitrogen compounds and condensed aromatics were characterized by a Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS) and GC-MS. The results show that the basic nitrogen compounds are mainly composed of acridines and cycloalkyl-acridines. Benzocarbazoles are of the most relative abundance in non-basic nitrogen compounds. The main polycyclic aromatics are three ring aromatics with short side chain. Based on coking mechanism of FCC process, two suitable processes were proposed for processing high-nitrogen feedstocks: the pretreatment-FCC combined process (physical improvement method) and the partition conversion process (chemical improvement method). The results of partition conversion process show that the conversion and gasoline yield increase 5.84 percentage points and 6.49 percentage points, respectively with improved product distribution.