Abstract: 316L/POM composite parts were prepared by fused deposition modeling (FDM). The effects of debinding temperature, catalyst flow rate, debinding time, sample size, and filling rate on the debinding rate of FDM parts were studied. The results show that, the debinding rate increases with the increase of debinding temperature but decreases at 130~140 ℃. The increases of the catalyst flow rate and debinding time aggrandize the bebinding rate. The debinding rate decreases with the increase of the sample thickness and filling rate, but the plane size of the samples has little impact on the debinding rate. The computed tomography (CT) and scanning electron microscopy (SEM) of FDM parts reveal that the gas exchange channel network formed in the large fuse gaps during FDM printing can accelerate the debinding rate.