This study investigates the influence of two process conditions on fiber orientations and tribological characteristics of POM/GF composites. The morphologies of fiber layers were observed to elucidate wear mechanisms, and the correlation between fiber orientation and fiber layer thickness. Experimental results indicate that there are three distinct layers from top surface to the corea solidified layer, intermediate layer, and core layer. The tribological characteristics decreased as thickness of solidified layer decreased. Furthermore, minor grooving and debonded fibers were the major wear mechanisms for P-direction specimens. Severe cracks and cut fibers were the major wear mechanisms for AP-direction specimens.