Chitinase,degrating chitin——a major component of most fungal cell walls exists in microbe，plant and animal. In recent years,much attention has been focused on antifungal function and their practical prospects,which chitinases play within the plant. A detailed summary of the literature,the induction,subcellular location and antifungal activity of chitinases in compatible combination,incompatible combination and endomycorrhiza is provided.