Rice seedlings need sufficient light for normal growth. The increasing temperature demand of early spring seedling has promoted the development of greenhouses， greenhouses and factory facilities. However， due to the reflection and absorption of sunlight by glass and plastic， the lack of light in facility seedlings is prominent. Supplementary lighting can better solve the problem of lack of light in facility seedling， LED as the representative of the supplementary light source has been promoted and applied in facility seedling， but it still has high energy consumption problem. Laser is the only artificial light source with parallel light characteristics of sunlight， with good correlation， good monochromism， good directivity， high brightness， large energy， photoelectric conversion efficiency， energy saving and so on. Studies have shown that the special light quality of laser can effectively improve the photosynthesis efficiency of seedlings. The traditional laser light source represented by He-Ne laser is large in volume， high in cost， and difficult to be popularized. Using semiconductor laser combined with uniform light technology to develop a new laser light source， small size， low cost， can achieve a large area of uniform laser irradiation of rice seedlings， the single lamp irradiation area can reach 60-70 square meters. At the same time， the new laser light source retains the traditional laser correlation， monochromism and directivity， and also has the characteristics of high efficiency and energy saving， and the energy consumption can be only 1/30 of the traditional LED light source. The results showed that reasonable irradiation of new laser light source in the process of rice seedling cultivation can improve the quality of seedlings， fast greening after transplanting， more tillers， early heading， and finally achieve stable and increased rice yield. Since 2021， the test results in many places across the country have shown that the use of a new laser light source to irradiate rice seedlings for about 20 days before transplanting can achieve a yield increase of more than 10%. This result not only provided important technical support and guarantee for improving the quality and yield of rice in China， but also provided a new method and means for other plants to fill light at various stages.