The　traditional　centralized　trading　model　in　the　energy　field　is　affected　by　its　centralized　processing　method.　There　are　many　problems　such　as　high　maintenance　costs　and　inability　to　guarantee　openness　and　transparency,　which　restrict　the　willingness　of　trading　entities　to　enter　the　market.　To　this　end,　this　paper　proposed　and　developed　a　weakly　centralized　multi-energy　trading　system.　First,　from　the　blockchain,　a　distributed,　tamper-resistant　decentralized　technology,　based　on　the　Ethereum　platform,　the　placing　energy　trading　mechanism　was　written　into　smart　contracts.　The　administrator　role　could　add　or　delete　energy　types　that　allow　transactions,　and　users　could　initiate　real-time　transactions　and　information.　Inquiry,　a　transaction　matching　model　based　on　the　market　supply　and　demand　relationship　for　smart　contracts　was　discussed.　Next,　the　contract　was　deployed　in　the　Ethereum　private　chain,　and　the　ether.js　interface　was　used　to　interact　with　the　client　to　realize　the　visualization　of　smart　contracts　and　satisfy　user　transactions　with　the　query　requirements,　while　the　user　information　was　stored　in　the　database,　the　administrator　realized　the　management　of　energy　and　users　without　interference　in　the　transaction　process.　Finally,　the　reliability　and　profitability　of　the　platform＇s　functions　were　verified　according　to　a　calculation　example.　This　weakly　centralized　energy　trading　system　provided　a　new　model　and　solution　for　the　application　of　blockchain　technology　in　the　energy　field.　©　2021　Chin.　Soc.　for　Elec.　Eng.