Abstract: Experiments were conducted in Pingdu and Taian of Shandong Province to determine the effects of hydrogen cyanamide (Dormex) sprays on vegetative and reproductive growth of sweet cherry(Hongdeng). In Pingdu greenhouse, cherry plants were sprayed to drip with 1.5% and 2.5% of hydrogen cyanamide on 24 Dec. 2003. In Taian greenhouse and field, cherry plants were sprayed with the same concentration on 12 Jan. and 10 Feb. 2004 respectively. For all experiments, plants were dormant and leafless at the time of spray applications. The results showed that hydrogen cyanamide effectively induced vegetative budbreak and flowering. In Pingdu, hydrogen cyanamide sprays advanced budbreak, flowering and fruit harvast time by 13, 8 and 7 days, but decreased mean fruit fresh weight compared to untreated. In Taian, hydrogen cyanamide advanced budbreak by 7 days, but fruit ripening no marked difference with control. The effects of hydrogen cyanamide on sweet cherry had relation to the treating time.