Nanoporous　tungsten　was　prepared　by　a　strategy　combining　mechanical　alloying　and　chemical　dealloying　at　room　temperature.　The　feature　size　of　the　nanoporous　structure　is　adjustable　by　modifying　dealloying　medium　and　duration.　The　formation　of　nanoporous　tungsten　is　dependent　on　the　surface　diffusion　of　W　atoms　and　their　diffusivity　in　the　dealloying　medium　is　in　a　magnitude　order　of　10(-20)　m(2)　s(-1).　The　structure　of　nanoporous　tungsten　has　a　high　activation　energy　for　surface　diffusion,　which　contributes　to　its　extremely　high　thermal　stability.　The　nanoporous　tungsten　may　be　promising　for　applications　at　high　temperatures.