In　Ni-doped　W　alloys,　1-4　wt%　of　Ni　was　often　employed　to　accelerate　densification　in　conventional　sintering　process　but　at　the　expense　of　restricted　service　temperatures　because　of　formation　of　liquid　phase.　To　break　the　dilemma,　in　this　work　0.1　wt%　Ni　was　alloyed　into　W　matrix　and　achieved　98%　relative　density.　The　densification　and　grain　growth　behaviors　of　both　pure　and　nickel　doped　tungsten　compacts　were　investigated,　in　which　a　potential　new　accelerated　sintering　mechanism　by　solid-solution　alloying　was　explored.　First-principles　calculations　demonstrated　the　transition　barrier　for　vacancies　in　W　system　was　lowered　by　34%　upon　Ni　doping.　This　alloying　process　therefore　was　beneficial　for　lattice　diffusion　of　tungsten　that,　in　turn,　improved　the　sintering　performance　and　service　abilities　of　tungsten-nickel　alloy.