For　the　smart　grid,　it　is　highly　significant　to　achieve　the　fixed-time　economic　dispatch　so　as　to　optimize　better　the　cost　of　power　generation.　It　can　effectively　save　the　communication　resources　by　taking　advantage　of　the　event-triggered　scheme.　In　this　paper,　a　fixed-time　economic　dispatch　algorithm　based　on　event-triggered　strategy　is　presented　to　solve　the　problem　of　limited　communication　resources　in　power　system　and　find　the　optimal　power　generation　in　a　finite　interval.　The　convergence　analysis　of　the　algorithm　and　the　proof　of　avoiding　Zeno　behavior　are　exhibited　in　details,　respectively.　Finally,　the　feasibility　and　advantage　of　the　optimization　algorithm　are　verified　by　numerical　simulation　for　economic　dispatch　of　grid　six　generators.　©　2022　IEEE.