An　imprinted　electrospun　fiber　membrane　was　developed　for　the　detection　of　volatile　organic　acids,　which　are　key　components　of　human　body　odor.　In　this　study,　hexanoic　acid　(HA)　was　selected　as　the　target,　polymethyl　methacrylate　(PMMA)　was　used　as　the　substrate,　and　colorimetric　detection　of　HA　was　achieved　by　a　bromocresol　purple　(BCP)　chromogenic　agent.　The　results　showed　that　the　morphology　of　the　fiber　membrane　was　uniform　and　continuous,　and　it　showed　excellent　selectivity　and　specificity　to　HA.　Photographs　of　the　color　changes　before　and　after　fiber　membrane　adsorption　were　recorded　by　a　camera　and　quantified　by　ImageJ　software　by　the　difference　in　gray　value　(Delta　Gray).　This　method　is　simple,　intuitive,　and　low　cost　and　has　great　potential　for　application　in　human　odor　analysis.