Spontaneous　brain　activity　studies　have　revealed　＇small-world＇　property　in　functional　networks　based　on　correlated　or　positively-correlated　relationships.　However,　studies　neither　investigated　negatively-correlated　functional　networks,　nor　checked　the　＇dynamic＇　properties　of　the　whole　functional　organization.　After　subjects　performed　a　specific　task,　what　changes　will　be　caused　in　the　intrinsic　organization?　In　this　study,　we　examined　pre-task　and　post-task　resting　brains　using　functional　MRI　(fMRI).　Then　we　suggested　two　perspectives　with　positively-correlated　brain　functional　network　(PCBFN)　and　negatively-correlated　brain　functional　network　(NCBFN),　by　testing　whether　correlation　coefficients　were　positive　or　negative.　The　major　findings　were:　1)　the　PCBFN　was　with　small-world　architecture　but　the　NCBFN　was　not,　with　different　motifs,　and　the　PCBFN　showed　stronger　small-world　effect　at　the　post-task　resting　state;　2)　Both　PCBFN　and　NCBFN　followed　an　exponentially　truncated　power　law　degree　distribution.　This　study　may　offer　a　framework　to　investigate　the　intrinsic　organization　of　spontaneous　brain　activity.　©　2010　IEEE.