Water albedo of fish pond has close relation with its physico-chemical features.As compared with most other free actual surfaces, water surface in this region is characterized by lower reflection ratio and higher absorption.Except the features of reflection ratio on general water surfaces, the reflection ratio on fish ponds has good negative relation with produciiviiy of phytoplankton in the fish ponds for this reason, utilization ratio of light energy has positive relation with primary productivity in fish ponds.