VTR-Pictuers taken under water are contain valuable and various information. Forevaluating quality of the pictuers,and studying about a model of light-transmission,experiments and real-sea observations are done. New evaluate method that uses a pattern-boad ispresented. Motion-analysis of suspended tracers are attempted for its application.The methodis based on travel distance between a pair of serial scenes.This method is applied for thestudy of velocity near the sea-bed.It shows good ability of advanced application of the pictuers.