In　order　to　solve　the　time-synchronization　problem　of　distributed　seismic　data　acquisition　system，we　designed　a　new　high-precision　time-synchronization　technical　system　in　this　paper.　In　this　system，a　synchronous　timing　pulse　was　transmitted　periodically　during　data　communication.　Through　transmitting　time　measurement　and　its　transmission　delay　time　correction　of　synchronous　timing　pulse，high-precision　multi-channel　time　synchronization　was　achieved　in　this　technical　system.　And　a　time-synchronization　technical　system　designed　with　high-speed　programed　chips　was　used　to　carry　out　the　time-synchronous　test.　The　result　proves　that　the　synchronous　timing　accuracy　of　time-synchronous　system　is　better　than　200　ns　when　the　optical　fiber　is　2　km，which　indicates　that　the　time-synchronization　system　is　stable　and　practical.　©　2022　Acta　Seismologica　Sinica　Press.　All　rights　reserved.