Various functions of polymer composites, including electrical conductive, thermal conductive, dielectric, EMI shielding, strain sensing, etc, has been extensively investigated. These functions need to be delivered by functional filler or structure. Therefore, the morphological control of these functional filler or structure should play vital role on the final properties of these functional polymer composites. In recent years, we have carried out a series of studies focusing on “The relationship between different morphological control methods--filler network morphology & property—functionality”. Efforts have been made on investigating various morphology control methods including: construction and destruction of filler network during processing, multi-layered structure through high speed thin-wall injection molding and macroscopic segregated network structure. Herein, the formation of multi-layered structure during high speed thin-wall injection molding process will be introduced. The thermodynamic and kinetic issues influencing the formation of such structure and the application of such structure for the preparation of functional polymer composites will be systematically discussed.