Abstract: The mechanically fastened joint specimen tensile test of three kinds of glass fiber reinforced thermoplastic resin composites including glass fiber/polyamide (GF/PA), glass fiber/polyformaldehyde (GF/POM) and glass fiber/polypropylene (GF/PP) were conducted. Additionally, low cycle fatigue tensile test was carried out for three kinds of composite mechanical joints, and the fracture surface of the sample before and after fatigue was observed by SEM, to investigate the effect of joint dimension (sample width/hole diameter(w/d) and edge distance/hole diameter(e/d)) on the failure load of mechanically fastened joint and failure mode. It is found that:The bearing capacity of the mechanically fastened joint of glass fiber reinforced thermoplastic resin composites increases with the increase of e/d at a certain w/d, and tends to be stable when w/d ≥ 3 and e/d ≥ 2. The failure mode is mainly tensile failure. Low cycle tensile fatigue has a certain effect on the tensile strength of GF/POM and GF/PA mechanically jointed specimens, but has no significant effect on that of GF/PP. On the other hand, low cycle fatigue stretch has no obvious effect on the failure mode of the mechanically bonded specimens of glass fiber reinforced thermoplastic resin. SEM observation shows that, with the increase of the fatigue load level, the number of pulled fibers on the fracture surface of GF/POM and GF/PA increases, while there is no significant effect on the existence of fiber and matrix in GF/PP.