As a new high-temperature material,Cf/SiC ceramic matrix composites has a wide applications range in aerospace field, but its difficult processing characteristics brings new challenges. A laser-assisted high-speed micro-turning machine was used to perform external cutting on the Cf/SiC ceramic matrix composite material, with the main cutting force Fz as the target, the cutting parameters of Cf/SiC ceramic matrix composites were optimized.Single factor test and multi-factor orthogonal test were used to study the influence of workpiece speed n, cutting depth ap, feed speed vf and power density q on the cutting force in the three directions of x, y and z.Through variance analysis method, the primary and secondary order of the influence of each processing parameter on Fz and the optimal parameter combination were pointed out. The results show that: compared with conventional high-speed micro-turning, using laser-assisted high-speed micro-turning technology can improve the cutting force in all directions, and the maximum cutting force is reduced by 81.436%; the influence of each test factor on Fz from large to small is q＞n＞ap＞vf; the optimal combination of processing parameters is:q=400 W/mm2,n=4 000 r/min, ap=20 μm, and vf=20 mm/min, the best Fz is 1.831 N.