The particle reinforced metal matrix composite (PRMMC) is more and more widely used for their excellent physical and chemical properties. However, its application is limited by its poor machinability. Laser heat assisted machining (LHAM) is an efficient method to solve this problem. In this paper LHAM is adopted in cutting Al{sub}2O{sub}3 particle reinforced aluminum matrix composite (Al{sub}2O{sub}3p/Al) and the PRMMC's cutting physical model is set up with the theory of microstructure misfit and dislocation. The PRMMC's interior mechanism of the LHAM, the reduction of the cutting forces and the tool wear, and the improvement of mechanical performance of the cutting surface are indicated with the physical model. The model is the fundamental and orientation of further research and application.
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