In recent years,water-zinc ion batteries have been widely concerned in the new energy storage system in the post-lithium eradue to their advantages of low cost,abundant resources,and high theoretical capacity of the zinc negative electrode. However,findingsuitable cathode materials is the key and challenge in the development of zinc-ion batteries. Polyoxomethanate (abbreviated aspolyacids) are considered to be a highly promising electrode material due to their high redox activity and multi-electron transfercharacteristics. However,issues such as easy dissolution,easy agglomeration,and poor conductivity of polyacids have hindered theirapplication in the energy storage field. In order to solve these problems,polyaniline (PANI) was in-situ grown on the surface ofgraphene oxide (GO) as the substrate,and Keggin-type polyacid H3PMo12O40 was supported by electrostatic interaction. Finally,therGO-PANI-PMo12 (GPM) composite materials were prepared. The intention of this work was to utilize graphene and its surface functional groups to improve the immobilization,dispersibility,and conductivity of polyacids. The characterizations of XRD,FTIR,SEM,TEM,XPS,and electrochemical performance tests were used to explore the influence of the ratio of GO and ANI on their morphology,structure,and electrochemical performance. The results showed that when the mass ratio of GO to ANI was 1∶20,the prepared GPMmaterial exhibited both high redox activity of polyacids and high conductivity of graphene,having a high discharge specific capacity of258 mAh/g at 0.2 A/g,and a capacity retention rate of 82.2% after 1000 cycles at 2 A/g,demonstrating good cycle stability. In addition,theresults of reaction kinetics studies indicate that the electrochemical reaction process of the GPM electrode is controlled by both diffusionand capacitance,thus exhibiting a faster Zn diffusion rate and charge transfer rate.