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To research an effective measure of reducing the soot and NOx in engine at the same time, different nozzle hole diameters coupled with exhaust gas re-circulation were adopted in this study based on KH-ACT spray breakup model, which takes the aerodynamic- induced, cavitation-induced, and turbulence-induced breakup into account. The SAGE detailed chemistry combustion and the new atomization model used in the simulation have been verified with the experiment data from YN4100QBZL engine. Different diesel nozzles were adopted in the study combined with different exhaust gas re-circulation rates ranging from 0% to 40%. The simulation results show that the NOx emission could be reduced effectively for both small (0.1 mm) and large (0.15 mm) diesel nozzles when increasing exhaust gas re-circulation ratio. The soot emission increases for the small nozzle hole size as the exhaust gas re-circulation increasing. However, when it comes to the large diesel nozzle, the emission increases slightly firstly and decreases quickly when the exhaust gas re-circulation rate above 20%. [ABSTRACT FROM AUTHOR]