Results in the work indicate that the reason for the non-russeting mutant of ‘Golden Delicious’ apple, ‘Feng Shuai’, not torusset may be related with its synthesizing enough endogenous CAin the peels during its early development stage. When exogenousCA solutions were sprayed at about 4 weeks after full bloom, therusseting was significantly inhibited in ‘Golden Delicious’ apples.CA application can stimulate total flavonoids biosynthesis butinhibit lignin accumulation at transcribe levels. Therefore, inhibi-tion of lignin biosynthesis by endogenous or exogenous CA couldbe an important event of russeting prevention of ‘Golden Delicious’apple.