In order to verify the power generation advantages of bifacial modules in optimized light-environment distributed power plants, two batches of modules with stable performance after outdoor degradation were selected and the peak power of both sides of some bifacial modules were measured, then a bifacial power plant in optimized light-environment and a monofacial power plant by conventional installation method were built and the monthly energy yield of the two plants were collected, at last the irradiance of both sides and the power of bifacial modules at typical locations were measured. By analyzing the difference of data, it is found that bifacial modules have better peak power bifaciality coefficient, which is beneficial to reduce the mismatch loss between modules and output more power; bifacial power plant has yield gain in all months, the annual yield gain reaches 21.53% and the highest monthly yield gain is about 25%, which is beneficial for distributed power plants to pursue maximum yield per unit area. For distributed power plants with good reflective background, the irradiance gain and equivalent peak power of bifacial modules at different locations are different, so changing the string connection is beneficial to output more power and energy yield.