T-2　toxin,　a　hazardous　mycotoxin　often　present　in　cereals　and　products　based　on　cereals,　poses　a　substantial　risk　to　humans　and　animals　due　to　its　high　toxicity.　The　development　of　uncomplicated,　quick　and　highly　sensitive　methods　for　detecting　T-2　toxin　is　imperative.　In　this　work,　a　portable　sensing　system　was　constructed　using　water　column　height　as　a　readout　device　in　combination　with　a　controlled　release　system,　which　allows　for　an　accurate　quantitative　analysis　of　T-2　toxin　without　the　need　for　expensive　instrumentation　or　skilled　technicians.　Hyaluronic　acid　(HA)　hydrogel　was　constructed　by　double　cross-linked　DNA/aptamer　hybrids　with　polyethyleneimine　(PEI)　and　embedded　with　platinum　nanoparticles　(Pt　NPs).　The　aptamer　specifically　bound　to　T-2　toxin　in　its　presence,　resulting　in　the　disruption　of　the　hydrogel　and　subsequent　release　of　the　Pt　NPs.　These　Pt　NPs　were　later　mixed　with　a　solution　of　H　2　O　2　in　a　confined　reaction　flask,　leading　to　the　decomposition　of　H　2　O　2　into　O　2　.　A　glass　capillary　tube　containing　a　column　of　red　water　had　been　inserted　into　the　cap　of　the　reaction　flask,　and　the　low　solubility　of　O　2　led　to　an　increase　in　pressure　within　the　reaction　unit,　causing　the　red　water　column　to　rise.　There　is　a　good　linear　correlation　between　the　height　of　the　capillary　liquid　level　and　the　T-2　toxin　concentration　in　the　range　of　20　ng/mL　to　6　mu　g/mL.　The　system　has　been　successfully　used　to　detect　T-2　toxin　in　samples　of　barley　tea　and　corn.