Using　acrylic　acid　(AA)　as　pH-responsive　monomer,　and　N-isopropyl　acrylamide　(NIPAM)　as　temperatureresponsive　monomer,　the　stimuli-responsive　P(NIPAM-co-AA)　copolymers　were　prepared　via　soap-free　emulsion　polymerization.　Their　constructed　porous　structures,　swelling-shrinking　behaviors,　and　controlled　drug　delivery　performances　were　systematically　demonstrated　via　various　characterizations.　Particularly,　the　smallangle　X-ray　scattering　(SAXS)　method　was　employed　to　elucidate　their　fractal　features　and　the　structural　evolutions　with　increasing　AA　content,　showing　the　occurrences　from　dense　aggregates　(mass　fractal　(Dm)　value　of　2.92)　to　loose　networks　(surface　fractal　(Ds)　value　of　2.18)　with　statistical　self-similarity.　Meanwhile,　the　ibuprofen　(IBU)　was　used　as　a　model　drug,　their　temperature/pH-dual　sensitive　delivery　and　related　mechanism　were　discussed　on　the　basis　of　the　fractal　demonstrations.　The　results　showed　that　the　cross-linking　networks　with　an　interconnected　open-cell　skeleton　and　abundant　large　pores　were　beneficial　to　improve　the　adsorptiondiffusion　performances　of　the　drug　delivery,　while　the　drug-releasing　kinetics　of　P(NIPAM-co-AA)-30　followed　a　non-Fickian　diffusion　mechanism.　Specially,　the　fractal　evolutions　of　the　obtained　copolymers　along　with　the　drug　loading　and　releasing　behaviors　were　evaluated　via　SAXS　patterns.　In　which,　the　drug-loaded　copolymers　presented　the　Ds　characteristics　with　the　increased　amounts　of　monomer　AA　added.　While,　the　fractal　features　varied　from　Ds　value　of　2.40　to　Dm　value　of　2.76　along　with　sustained　drug　releasing　in　pH　2.0　at　25　degrees　C,　indicating　that　the　structural　transformation　of　the　used　copolymers　occurred　from　dense　(Dm　value　of　2.86)　to　loose　(Dm　value　of　2.76)　with　the　extension　of　release　time.　These　demonstrations　suggested　that　the　resultant　P(NIPAM-coAA)　hydrogel　is　a　potential　intelligent-responsive　drug　carrier　for　targeted　delivery.