After digging the fill light market for crops growing,microwave sulphur lamps are used to fill light in agricultural green houses, which reduces the cost of energy used in traditional green houses, increases agricultural output value, and effectively expands the demand for agricultural electricity.The potential of fill light for crops growing is analyzed, the working principle and equipment structure of microwave sulfur lamps is introduced, and the advantag es of microwave sulfur lamps in agricultural production is intro duced as well.The application of experimental projects is specifical ly explained.The agricultural experiment in Luoyuan, Fuzhou proves that the microwave sulfur lamp fill light technology can significantly increase the crop output, and the energy consumption is greatly re duced, which has a market promotion prospect.