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The DFT-based (density functional theory) ab initio quantum mechanical methods have been applied to study the basicity of the nitrogen-containing compounds in petroleum.The results have indicated that there is a distinct relationship between the protonation energy of nitrogen-containing compounds and their basicity.The more negative the protonation energy,the stronger the basicity is.It has been also found that aliphatic amines are more basic than pyridines or aromatic amines,and all these compounds are more basic than pyrroles.The addition of the aromatic rings can influence the basicity of anilines,while the 5- and 6-membered heterocyclic compounds function differently.The solvent properties may affect the basicity of these nitrogen-containing compounds.