Fluorescence　immunochromatographic　assay　(FICA)　is　a　quantitative　detection　technique　widely　used　in　clinical　diagnosis,　environmental　monitoring,　and　food　safety.　To　deal　with　the　limited　applications　caused　by　insufficient　detection　range,　this　paper　proposes　a　photoelectric　adjustment　system　suitable　for　FICA　strip　readers　to　expand　its　detection　range.　The　photoelectric　adjustment　system　is　proposed　based　on　the　relationship　between　the　excitation　light　intensity　and　the　fluorescence　intensity,　which　provides　the　optimal　excitation　light　intensity　and　a　stable　baseline　amplitude　for　the　FICA　strip　reader.　To　verify　the　proposed　system,　it　was　applied　to　the　strip　reader　we　had　previously　developed.　The　results　show　that　the　linear　detection　range　of　the　FICA　strip　reader　was　extended　from　1.95-256　mu　g/mL　to　1-1024　mu　g/mL　after　using　the　proposed　method.　At　the　same　time,　the　accuracy　of　the　FICA　strip　reader　does　not　deteriorate　and　is　in　good　comparisons　with　the　conventional　ESEQuant　Lateral　Flow　Reader　(with　R-2　＞　0.9987).　Therefore,　the　proposed　photoelectric　adjustment　method　and　system　can　improve　the　detection　range　of　the　strip　reader　or　other　similar　devices.