MC nylon-6-b-polyether amine copolymers were synthesized with macro-initiator based on amino-terminated polyether amine（PEA） functionalized with isocyanate via in-situ polymerization. It was found that introduction of PEA delayed the polymerization process of caprolactam by decreasing maximum heating-rate (Rmax) and prolonging the time (tmax) corresponding to Rmax, resulting in the decrease of molecular weight of MC nylon-6. High grafting efficiency of PEA can be achieved. With the increase of PEA molecular weight, Rmax and grafting ratio decreased slightly. With increasing content of PEA, the melting peak became declining and widening, while the crystallinity and crystal grain size decreased gradually, indicating that the crystallization ability of nylon-6 matrix was weakened by incorporation of PEA molecular chains. In the meantime, the fracture surfaces of the copolymer changed from irregular mosaic to the striation, presenting tough fracture characteristic, and the notched impact strength of the copolymers were improved dramatically. Noteworthy is that the remarkable increase of crystallization ability and mechanical property can be observed with increasing PEA molecular weight. The electrical resistivity of the copolymers was increased by three orders of magnitude, and kept stable with the prolongation of storage time, indicating a permanently antistatic ability. The improved antistatic mechanism of the copolymers was deduced by the increase of concentration of oxygen atom and C-O group on the surface of the copolymers with the increasing PEA content. The water contact angle decreased and surface tension increased, and finally the hydrophilicity of the copolymers was enhanced, resulting in the fairly good antistatic behavior of the copolymers by absorbing moisture from air.