This paper reports the results of research on image reconstruction and image processing techniques for photos of poly metallic nodules from the bottom of deep sea. The major troubles with submarine photos include uneven distribution of illuminance, unsatisfactory focusing, frequent existence of iron wire image, local mud interference etc. The present paper analyses the mathematio model for distiibution of illuminance and derives the formulae for illuminance distiibution and light sensitivity distribution under the conditions of inclining camera system and horizontal camera system. Using image proces sing system, we have successfully developed a suite of image reconstruction and image processing techniques suitable for submarine photos and drawn a detailed flow chart. As examples, four pictures are attached to this paper, which illustrate the obvious effects of our method in such aspects as elimina ting uneven illuminance and iron wire interference, laising contrast and resolution power, automatic classification and scientific statistical analysis of coverage, and indicate the possibility of examining textures and shapes of the nodules by means of partial enlargement. The method described in this paper serves as an important tool for improving and studying precious submarine photos.