Eco-Huang",a new pollution free flower thinner agent invented in Republic of Korea,can be used in production of"green"apple and organic apple.In this study,2 cultivars of apple,‘Gala’and‘USA-8’ were used as test materials to study effect of"Eco-Huang"on fruit thinning and growth and quality of apple.Results showed that fruit thinning effect of"Eco-Huang"was significant on two apple varieties when it was sprayed at full blossom at the concentration of 1:150.In addition,"Eco-Huang"has neither negative effect on fruit nutritional quality,nor on the antioxidant activities of apple fruit.