Abstract: The phytohormone gibberellins (GA) play an important role in controlling and modulating diverse developmental processes, such as seed germination, hypocotyls elongation, leaf expansion and flowering time.In recent years, there are significant progresses in understanding of GA biosynthesis pathway and GA signaling in Arabidopsis and rice. This review highlights GA biosynthesis pathway and their regulation, including a new pathway identified in rice, and molecular model of“ De-repress” in GA signaling. GA promotes plant growth via 26S proteasome-dependent proteolysis of DELLA proteins repressors, one of the key component in GA signaling, and also depends on GA-mediated interaction between GA receptor and DELLA proteins. Finally, this paper discussed the cross-talking between GA and other hormones, and modulation of adaptation to environments.