In order to determine the effectiveness of nano-CaCO3 appendix on chitosan, fresh cut yam were treated by chitosan coating with nano-CaCO3 appendix before stored at 10℃. The results indicate the titratable acidity (TA), Vitamin C content and L value of treated fruit by chitosan coating with nano-CaCO3 appendix was 10.5%, 8.4% and 6.9% higher than that of chitosan coating fruit, while the weigh loss and total phenolic content were 9.2% and 8.3% less than that of chitosan coating fruit. It also inhibited the activities of polyphenol oxidase (PPO) and peroxidase (POD) maintained lower level of BI and prolonged shelf-life. Therefore, chitosan modified with nano-CaCO3 have potential use in fresh cut yam storage.