Abstract: Poly(vinylidene fluoride) (PVDF)/graphite composites were prepared by a solution-blending method, and the effects of graphite content and compounding process on the thermal conductivity of composites were studied. The results indicated that there was a clear increase trend observed in thermal conductivity of the composites with the graphite content increasing over 40 wt %. The thermal conductivity of composite reached 20.92 W/（m·K） when 70 wt % of graphite was added, which is 110 times as much as that of pure PVDF. The thermal conductivity reached a maximum value at the graphite weight ratio of 1∶9 with the particle sizes of 270 and 106 μm, respectively. The higher thermal conductivity could also be achieved for the composites by using laminated rotor than by using drum-shaped rotor. Moreover, the thermal conductivity was slightly affected by rotor speed and mixing time. The plate heat exchanger plate based on the PVDF/graphite composite was designed and prepared to verify the feasibility of experimental production.