Abstract: It has been proved by practice in the last few years that sugarbeets can grow well in the South of our country. Nevertheless, the overwintered sugarbeet plants grown in that area rarely flower so that the seed production of the crop is in difficulties, and consequently disadvantageous to the agricultural extension work. According to the results of two years research work we have done in Miloo River State Farm of ttunan, it has been found that the major reason why the plant fail to produce flower in that area is the insufficient daily photoperiod during the key period in the spring season. Accordingly with a light extension or night-break treatment the percentage of flowering plant can be raised remarkably. Moreover, it is of interest to note that application of GA accompanied by the supplimentary illumination can significantly increase the percentage further, although the promotive effects of GA treatment alone on flowering of this crop is by no means noticeable. It is reasonable to suppose that such a promotive effect of GA on flowering of sugarbeets should be helpful to the seed production industry in Hunan as well as some other areas, and also it is a possible approach in researching the mode of action of GA on flowering.