The　chemiluminescent　behaviour　of　some　indole　derivatives　in　alkaline　solution　in　the　presence　of　Fe3+　was　studied　in　detail.　The　effects　of　various　kinds　of　surfactants　and　oxidants　on　the　chemiluminescent　reaction　were　studied.　A　flow　injection　system　with　chemiluminescent　detection　was　developed　for　the　determination　of　tryptophan,　and　the　effects　of　some　inorganic　ions　and　basic　amino　acids　were　examined.　Based　on　the　results　of　treatment　with　the　Hückel　molecular　orbital　method　and　the　investigations　of　fluorescent　and　absorption　spectra,　the　relationship　between　structural　characteristics　and　chemiluminescent　behaviour　is　discussed,　and　a　possible　mechanism　for　this　chemiluminescent　reaction　is　proposed.