Abstract: 4% ethephon UL was sprayed to plant of late energy sugarcane, the field trial results of 2011要2012 showed that different treatments had no obvious effect on growth and biological yield, but they can significantly increase sucrose content and improve the quality. The concentrations of 16 18 g per 667 m2 were the best, foliar spraying for sugarcane one time before harvest 1~2 months.