Abstract: The microstructure, dynamic visco elasticity, thermal expansion property and mechanical property of easy recycling PP/LCP composites are discussed in this paper. Not only the LCP is not dissolved into PP phase, but also two phases of PP and LCP possess good bonding strength because there were differences in the thermal expansion coefficient between the PP and LCP phases. When the addition content of LCP was less than 40 %, a reinforcement phase with LCP as fiber situatied in PP matrix was formed and distributed in the flow direction. When the addition content of LCP was more than 60 %, the ductile and strength properties would decrease due to the existence of PP phase.