The　spherical　tungsten　powder　was　fabricated　by　spray-drying　method　combined　with　hydrogen　reduction　using　ammonium　metatungstate　(AMT)　as　raw　materials.　The　powder　morphology,　mean　particle　size,　particle　size　distribution　and　phase　transformation　process　of　reduction　were　characterized　by　SEM,　TEM,　XRD　and　laser　diffraction　particle　size　analyzer,　respectively.　Results　show　that　the　morphology　of　the　powder　prepared　by　spray　drying　is　hollow　sphere,　and　both　of　AMT　and　WO3　powder　has　similar　good　spherical　structure　with　smooth　surface.　TEM　results　indicate　that　the　process　parameters,　such　as　the　slurry　concentration,　compressed　air　flow　rate,　and　liquid　feeding　rate,　play　important　roles　in　controlling　the　performance　of　AMT　microspheres,　such　as　the　size　distribution.　It　is　found　that　calcination　has　no　effect　on　the　particle　morphology　and　phase　composition.　The　mean　size　is　increased　with　the　increase　of　the　slurry　concentration　and　compressed　air　flow　rate,　but　the　size　distribution　changes　slightly　with　different　liquid　feed　rates.　The　X-ray　diffraction　patterns　indicate　that　alpha-W　phase　is　obtained　after　reduction　at　550　degrees　C　for　2　h　in　hydrogen　atmosphere,　but　WO3　still　exists;　after　reduction　at　750　degrees　C　for　2　h,　WO3　disappears,　and　a-W　phase　exists　in　the　powder.