In this paper, some experiments were carried out by using PCD tool to bore carbon fiber reinforced
plastics (CFRP) and the influence of cutting parameters on cutting force and hole exit tear factor(the ratio of tear size
and hole diameter) was analyzed. The testing results showed that 3-D components of cutting forces increase along
with the increasing of the cutting depth, feed rate and cutting speed. It is indicated that the raise of cutting speed results
in the increasing of yield-stress of the material. Large corner radius causes the highest radial force, followed by
the main cutting force and axial force;Tear factor is almost independent of cutting depth, but there is a linear positive
correlation between the factor and feed rate. When increasing the cutting speed the value of tear factor shows a tendency
to decrease and then kept essentially constant. Boring CFRP using PCD tool can effectively reduce tear degree of
hole exit.