In two-year trial of different seeding times and seedling ages, the safe full heading date and appropriate seeding date of different types of late seasonal machine transplanted rice, such as indica hybrid rice Wuyou 308, indica-japonica hybrid rice Yongyou 2640 and japonica hybrid rice Jiayou No.2, were investigated. The results showed that the production of all the tested cultivars decreased with the delay of seeding time; Wuyou 308, Yongyou 2640 and Jiayou No.2 fully headed in the seedling age of 18 d when they are planted before June 3rd, June 6th and June 9th respectively. Jiayou No.2 showed the best tolerance to delayed seeding, but significantly lower production compared to Wuyou 308 （highest） and Yongyou 2640. Wuyou 308 had inferior seedling quality and narrower appropriate seedling range compared to Yongyou 2640. The optimum range of seedling age for machine transplanting of Wuyou 308 was 12 to 20 days, and that of Yongyou 2640 was 17 to 27 days. When the seedling age of Wuyou 308 was over 21 days, its heading stage will delay, the risk of being unable to full heading will increase, and lead to obviously lower production than Yongyou 2640.