Three types of rice varieties including supper hybrid rice, hybrid rice and conventional rice were used to explore the relationships between radiation use efficiency (RUE) and grain yield. The results showed as follows. Grain yield of super hybrid rice was higher than hybrid rice and conventional rice on the same sowing date, and there was a significant difference among three types of rice varieties sowing May 22. And grain yield sowed in 22 May was higher than sowed in July 17. There was higher grain yield of super hybrid rice because of high spikelet numbers. Grain yield sowed in May 22 was higher than sowed in July 17. There was higher radiation use efficiency of super hybrid rice. There was a significant negative correlation between RUE and the filled ratio during rice growth and development sowing May 22, and a significant positive correlation between RUE and 1 000-grain weight from booting to head-flowering, but RUE was not related to the other indices, including the number of spikelet, grain yield and harvest index; there was a significant negative correlation between RUE and the filled ratio on the MT and FL sowing July 17, and were no significant trend among RUE and the other indices, such as the number of spikelet, grain yield and harvest index.