Abstract: It introduced the manufacture technology of polylactic acid(PLA) meltblows.Through the SEM images,filtration efficiency and permeability test of the meltblowns,it analyzed the production parameters that affected the performance of PLA meltblowns,such as drying process,spinneret temperature,hot air temperature and press(velocity),the width of air gap.The results showed that PLA was a good material for meltblowing process and its spinning temperature was 190-230℃with the perfect temperature of 220℃.The diameter of fiber increased with the increase of hot air temperature.And the crimp degree of fiber decreased with the increase of hot air press(velocity).Also with the increase of air gap width,the diameter of fiber increased and crimp degree decreased.Furthermore the performance of the PLA meltblowns was affected accordingly by these hot air parameters.