Abstract: The canes with well-developed buds from Fujiminori grape grown in a vineyard in Nanshan Agricultural Science and Technology Demonstration Park in Zhenjiang of J iangsu Province were treated with CaCN₂ and salicylic acid ( SA) at three different stages of dormancy to study the effects on dormancy-release of grape bud in an experiment from December 2003 to March 2004. After treatment, the twigs were put in the greenhouses for sprouting cultivation. The content of H₂O₂ , activities of antioxidant enzymes of grape buds were investigated every 5 days, and the sp routing percentage of grape bud after 21 days was calculated. The results showed that CaCN₂ and SA increased resp iratory rate, H₂O₂ content, POD activities, and decreased
CAT activities, but had different effects on SOD activities at different stages of dormancy. The increased degree of H₂O₂ content, POD and SOD activities of flower buds at the early stages of sp routing cultivation was higher, but the decreased extent of CAT activities of flower buds was larger, when treatments with chemicals
had significant effects on dormancy-release or sp routing. The results of sp routing rate showed that CaCN₂ and SA had no effect on dormancy-release in early-dormancy stage. The treatment of 25% CaCN₂ had a significant
effect on dormancy-release of grape bud at deep-dormancy stage or late2dormancy stage, the sp routingwas 4 -6 days earlier than those of control ( no CaCN₂ and SA treatment) grapes, and the final sp routing rate reached 41.6% - 90.0%. SA had little effect on dormancy2release of grape bud.

Key words: Grape, Calcium cyanamide, Salicylic acid, Dormancy2release, H2O2, Antioxidant enzymes