Abstract: Barnyard grass is an intergeneric plant that carries the favorable genes of rice needed. In order to study the effects of photosynthetic characteristics of rice that barngrass gene transduction, introduced barnyard grass DNA into ''Yu805B'' by pollen tube pathway, a new rice ''Yu 819B'' was selected. Comparing the SPAD value, photosynthetic index, yield structure and combined yield of ''Yu 819B'' and background parent ''Yu 805B''. The results showed that the yield of ''Yu819B'' was significantly better than that of ''Yu805B'' in chlorophyll content, net photosynthetic rate, intercellular CO2 concentration, yield structure and its combination, while the transpiration rate and stomatal conductance of photosynthetic index were lower than that of ''Yu805B''. It indicate that ‘Yu819B’ has typical high photosynthetic efficiency.