Abstract: The present experiment showed that gibberellin applied on the 20 days seedlings could accelerate the growth rate of its stem, and consequently the yield of the fibers was increased. The promotion of the growth of the stem is not due to theincrement of the number of internodes, but is chiefly due to the elongation of the irinternodes. The accumulation of dry matter of the internodes was increased also. If the fertility of the soil is poor, the treatment of ramie with gibberellin mayinduce the decrease of the fresh weight of leaves and chlorosis, the chlorophyll content is lowered. But if the soil is rich in nitrogen fertilizers, gibberellin may promotethe growth of leaves and the synthesis of chlorophyll. The content of cellulose and protein in the leaves is increased also. Gibberellin is able to inhibit the development of ramie, so the earlier floweringof the plant is prevented, the flowers and fruits are decreased evidently. The weightof the seeds and the percentage of gemination are lower than those of the control. Because the stem has acquired full nourishment, the vegetative growth is enhanced, and in turn this favoured the formation of fibers in the stem. If the application of gibberellin is accompanied by short-day illumination, the effect will be more evident than at long-day illumination. Through the fiber determination, it was shown that the treatment of ramie withgibberellin was able to promote the length and elasticity of the fibers, and the incrementof the thickness of the fibrous cells was not so evident as the increment of their length.