Abstract: In order to discuss the preservation effect of chitosan on okra fruit at room temperature,and to screen the appropriate concentration of chitosan and to explore how chitosan influence the quality and physiological change of okra at the same time,0,0.5%,1.0%,1.5% concentrations of chitosan were used on postharvest and then okra were stored at room temperature.The results showed that chitosan coating can play a significant effect on the okra,but the effect of different concentrations of chitosan treatment were different.Among the test groups,1.0% can keep okra at the best quality state,it significantly reduced the respiratory intensity( p < 0.05),delayed the appearance of respiratory peak,delayed the decline of chlorophyll,reduced the MDA content,and had influence on inhibiting the increasement of relative conductivity.It also could maintain POD and CAT activity at a high level.