The decay profiles of laser induced fluorescence for a variety of materials, such as crude, light and heavy oils are studied. The profiles have been determined under laboratory condition to assess the utility in the remote characterization and identification of oil spills. Fluorescence decay time for many oils are calculated by using the method of a convolution integral on the assumption that fluorescence response function would be a double exponential form. The specificity of the “fluorescence decay spectrum” appears to be somewhat superior to that associated with the normal fluorescence spectrum. The laser fluorosensor may be of particular interest in the new form of enviromental prove-sensor. Experimental technique and results are discussed in detial.