A　reasonable　preparation　processing　of　Lanthanum-doped　tungsten　wire　plays　a　decisive　role　in　the　final　properties　of　the　wire.　This　paper　gives　the　optimum　drawing　process　parameters　of　lanthanum-doped　tungsten　wire　with　phi　1.00　mm-phi　0.50　mm　and　explains　the　phenomenon　of　coarsening　of　fiber-like　grains　in　the　preparation　processing　of　tungsten　wire.　The　final　optimum　process　parameters　of　lanthanum-doped　tungsten　wire　are　given:　the　temperature　is　950　degrees　C　(the　first　pass　temperature　is　950　degrees　C,　and　the　temperature　decreases　by　about　20　degrees　C　for　each　pass),　the　compression　ratio　is　15%,　mold　temperature　is　550　degrees　C,　because　of　the　limitation　of　equipment　conditions,　the　wire　drawing　speed　is　fixed　at　0.19　m/s.　It　is　found　that　the　fiber-like　grains　of　the　tungsten　wire　coarsen　when　the　temperature　is　too　high,　and　it　is　prone　to　breakage　when　the　temperature　is　too　low　during　the　drawing　process.　When　the　compression　ratio　is　too　high　(for　example,　22%),　there　is　a　negative　impact　on　the　surface　quality　and　the　straightness　of　the　tungsten　wire.　When　the　compression　ratio　is　too　low,　the　processing　die　time　is　increased,　and　the　production　cost　is　increased.