The effect of mixing chitosan/nano-ZnO coating with different content of nano-ZnO on quality of cherry tomato was studied.The SEM pictures showed that the nanoparticles had a better dispersion in chitosan matrix at a relative low content of 1% and 2%.However,the aggregation of nanoparticles occurred when the content of nano-ZnO was up to 3wt%.The chitosan/nano-ZnO coating with 1% content of nano-ZnO had a better preservation effect on improving the sensory quality,decreasing the weight loss,Vc and acid content of cherry tomato.In contrast,the chitosan/nano-ZnO coating(2% and 3% content of nano-ZnO) showed little fresh-keeping effect on cherry tomato.