Abstract: The paper studied the effects of gibberellin acid treatment on flowering of chinese cabbage. The results showed that GA treatment promoted flowering of chinese cabbage. Mensurating the content of materials related to flowering, the content of soluble sugar and protein all increased after GA treating, the total C/N ratio increased. In addition, not noly the content of GA but also IAA increased after GA treatment, while the content of ABA was reduced, then rising. GA/ABA, GA/IAA and IAA/ABA were increased by GA treatment.