Based on the finite element software, a 3-D finite element model (FEM) of metal cutting was built. The cutting process of new-style Ti(C,N)-based nano-cermet cutter was simulated subsequently. Cutting force and toolwear were obtained as well as the distribution law of temperature. The optimum rake angle was calculated when cutting normalized 45# steel with Ti(C,N)-based nano-cermet cutter. The validity of the simulation results was demonstrated by a series of cutting tests. The simulation and experimental results show that 3-D simulation can disclose the cutting status more objectively than 2-D simulation, and it puts up a more effective method for research of metal cutting theory and development of new cutters.