The blue green algae in the culture ponds may effect the growth of culture organismsand deteriorate their quality.The purpose of this study is to investigate the effect of photosynthetic bacteria onsupressing the blue green algae which is the most abundant phytoplankton species ofbad environments in culture ponds. The research will establish the optimal dosage ofphotosynthetic bacteria to reduce the abuses of medicine in culture water and ensuresubstainable aquaculture in future.