A method for rap id analysis onsite of organic matter in sediment and soil is recommended.It is based on researches on the phenomenon of chemiluminescence of organic matter in sediment and soil reacting with ozone.A curve of chemiluminescence regularity was obtained by using an experimental prototype instrument,and used to analyze content and characteristics of the organic matter in sediment and soil,such as active organic carbon,hardly-oxidized organic matter,etc.Effectiveness of the method was verified comparing its results with those of the existing detection method.Based on the finding that sediments and soils varied sharply in chemiluminescence feature from type to type,a concept of "soil finger-print" or coding of soil properties is recommended.