This　research　concerns　asymptotic　stability　and　robust　stability　for　switched　positive　Takagi-Sugeno　(T-S)　fuzzy　systems　subject　to　dwell-time　constraints.　The　switched　positive　T-S　fuzzy　systems　consisting　full　of　unstable　positive　subsystems　are　considered　in　this　article.　In　order　to　handle　this　case,　a　time-dependent　multiple　copositive　Lyapunov　function　method　is　developed　together　with　a　ranged　dwell　time　switching　policy.　Then,　the　novel　stability　criteria　with　less　conservativeness　are　derived　for　the　investigative　system,　and　the　corresponding　result　is　simultaneously　extended　to　interval　uncertainty　systems　concerning　robust　stability.　Moreover,　all　criteria　are　presented　in　the　form　of　linear　vector　inequalities.　Eventually,　two　illustrative　examples　are　utilized　to　verify　the　effectiveness　of　the　proposed　analysis　framework.