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 provided by functional fillers or networks. Therefore, the morphological control of these functional filler should play crucial 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. The basic issues regarding these morphological control methods are thought to be the confinement, assembly and relaxation of inorganic functional filler in organic polymer matrix. Herein, these issues will be discussed in detail regarding their use for various functional polymer composites.