Triacontanol (TA) emulsive powder is a kind of widespread plant growth regulator. Since 1997, the work of experiment, demonstration and extension activities on rice in Fujian Province has got progress. The leaves are sprayed with 1 ～2 mg/L TA respectively for one time during the differentiation of juvenile ear and incubation period. The results show that TA can improve the growth of rice, increase the carbon and nitrogen metabolism, raise the effective ear, ear quantity and setting percentage. It also can increase thousand-grain weight and dry weight, and so on. Treating with TA can increase the dry weight of grain 0.964 t/hm² equally compared with the control. And the rate of increased yield is 15.4% . Besides, it can improve the quality of rice. According to the data of checking seed and measuring yield in several states for many times, it indicates that the effect of increase in yield remains stable. Not only input-output ratio is high, but also it has many advantages, such as non-poisonous, non-pollution, low cost and high-return, and it is easy to be operated.