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Abstract: This paper had studied on photoperiod sensitivity and suitable sowing and transplanting dates for super rice Xieyou 9308 as a double-cropping late rice with Shanyou 10 as control.For expirement of sowing date,5 treatments were set up respectively sowing on June 10, June 15, June 20, June 25, June 30 for Xieyou9308 and for expirement of transplanting date,5 other treatments were set up respectively transplanting on July15, July 20, July 25, July 30, August 4 for Xieyou9308 with all treatments sown on June 20,with Shouyou 10 as the control.This experiment was conducted Under the natural field environment in Wenzhou,China.The result showed that photoperiod sensitivity of Xieyou 9308 was stronger than that of Shanyou 10. Sowing from June 10 to June 30, the full heading stage advanced by 1 day for super rice 9308 and Shanyou 10 by 2 days with advanced sowing every 5 days. The optimum sowing date for Xieyou 9308 was fixed on June 25 according to conditions of light and temperature in Wenzhou.Too early sowing can not significantly advanced the full heading stage, but the yield of rice cut down because of the extension of seedling age and lower quality of seedling,and too late sowing will effect on the full heading of rice because of low temperature after late September. Sowing simultaneously on June 20 and transplanting from July 15 to August 4, the full heading stages advaced about 1 day with advanced transplanting every 5 days for Xieyou 9308 and Shanyou 10, and the yields of earlier transplanting trearments were significantly higher than that of later transplanting treatments.Due to its strong photoperiod sensitivity and longer growth period, Xieyou 9308 should be transplanted as early as possible when it is planted as a double-cropping late rice. [Copyright &y& Elsevier]