▎ 摘　　要

NOVELTY - Preparing graphene modified complex material comprises (1) mixing the graphene, filler, coating agent, surface treatment agent, dispersing agent and antioxidant to obtain mixed filler, (2) mixing the mixed filler with the first polymer matrix and performing the first melt blending to obtain a complex material precursor, and (3) performing the second melt blending of the complex material precursor to obtain the graphene modified complex material. USE - The method is useful for preparing graphene modified complex material. ADVANTAGE - The method: can improve the mixing and dispersing effect of graphene in the polymer substrate; increases the filling ratio of graphene in the complex material; and improves thermal conductivity, oxygen barrier effect and compression resistance of the graphene modified complex material. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) graphene modified complex material; (2) preparing a ground heating pipe comprising mixing the graphene-modified complex material with the second polymer matrix and performing molding treatment to obtain the ground heating pipe; and (3) ground heating pipe.