Simultaneous water quality surveys with satellite observation were carried out in Lake Shinji from July to November 1995. As a result, the technique of field survey in the lake was made olear. The field data were obtained in 8 out of the 12 surveys and instantaneous horizontal distributions of suspended substance (SS) and chlorophyll-a(chl-a) data in Lake Shinji were grasped. Horizontal distribution of SS and Chl-a in Lake Shinji generally tend to show low concentration on the coast of lake and high concentration in the center of Lake. On the contrary, transparency shows symmetrical trend.