The capacitive humidity sensors were fabricated based on silicon nanoporous pillar arrays(Si-NPA)and annealed at 250℃,450℃,550℃ respectively.The tested results showed that the sensitivity increased gradually with elevating of annealed temperature before 550℃,while the response time decreased and the rapid moisture sensitive response increased appreciably.But as annealed at 550℃,the sensitivity decreased sharply.Through the surface microstructure observation by the filed-emission scanning electron microscope...