A week before temperature rising,the winter bud eyes of late grapes in greenhouse were treated with the fruit trees dormancy breaking agent of 50% calcium cyanamide.The results showed that by using 20 times No.2 fruit trees dormancy breaking agent,the sprouting effect was better than using lime nitrogen,the sprouting period was 7 days ahead of time,the blooming period was 6 days ahead of time,the percentage of sprouting was increased 16.2%,the fruition rate was increased 9.1%.It could be used instead of lime nitrogen in production.