This study aimed to provide a reference for the practical use of forchlorfenuron (CPPU) in improvement fruit set and quality (especially size) litchi (Litchi chinensis Sonn.). CPPU at 5 mg/L was sprayed clusters ‘Feizixiao’ 2, 4, 6 8 weeks after female bloom (WAFB) 2017 6, 8, 9 or 10 WAFB 2018, with spraying water as control. The treatments were all effective suppressing abscission, resulting h...