With the support from National Nature Science Fund, this paper includes basic research of the influence factor of the wall-wetted fuel film after spray impingement with a flat wall.

Based on the fact that the fluorescence spectrum is dependont on the molecular structure of a substance, ocean lidar uses fluorescence detecting technique to examint oil content on the surface of the ocean.

This paper introduced the improvement measure method for the volume of a drop of oil and area of the oil film in the experiments of roughly measure molecular size by oil film method.