The black high temperature resistant polyester film was processed by a 60 W domestic CO2 laser. The influence of laser scanning speed, power, repetition frequency, defocusing amount and pulse width on the optical aperture, optical aperture and taper of the micropore was analyzed by orthogonal experiment. The optimized process parameters were obtained by comprehensive balance method. The results show that the laser scanning speed, defocusing amount and pulse width have great influence on the micro hole taper, defocusing amount and power have great influence on the aperture, and the optimized technological parameters are as follows: laser scanning speed 50 mm/s, power output 10%, repetition frequency 11kHz, The defocusing amount is 0 mm, and the pulse width is 0.1 ms. through the experiment, it is verified that the microporous optical aperture, optical aperture and taper obtained by the optimized parameter group are small, and the quality is good, which guides the upgrading of the enterprise production.