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The work aims to study tribology performance of dialkyl dithiocarbamic borate ester. A new extreme pressure and anti-wear additive of dialkyl dithiocarbamic borate ester(CNSB) was synthesized. When dialkyl dithiocarbamic borate ester was added to the base oil in proper proportions, the result was lubricating oil. Tribology performance of various lubricating oil was investigated by using a four-ball tester. Surface topography of wear scar was observed through scanning electron microscopy. By observing wear scar diameter, friction coefficient, maximum nonseizure load and surface topography of wear scar, the tribology performance and friction mechanism was investigated. With the increase of quality fraction of additive CNSB, friction coefficient, wear scar diameter and friction coefficient decreased rapidly, but the maximum nonseizure load increased significantly. The wear scar diameter of oil samples with 1.5% addition amount of CNSB decreased by 28.95%. The friction coefficient of oil samples with 2.0% addition amount of CNSB decreased by 34.48%. The maximum nonseizure load of oil samples with 2.0% addition amount of CNSB increased by 539 N. In the course of friction, the synthetic CNSB was decomposed. The appeared active S elements and a small number of N and B elements formed lubrication protective film, resulting in lower friction coefficient and good wear resistance. [ABSTRACT FROM AUTHOR]