In the desktop computing environment, files and directories are frequently changed, such as being created, deleted, modified, renamed, moved, and copied, which has higher demands on the real-time updating of desktop index and its efficiency. However,the traditional desktop index updating methods are fully or partially dependent on periodically full scan, which inevitably requires a large-scale index reconstruction and leads to long delay of index generation and high usage of system resources. In order to overcome these drawbacks, this paper puts forward a new desktop index real-time updating method based on a new file system events monitoring, and implements corresponding desktop index real-time updating system. Experimental results show that the proposed index updating method provides lower latency and lower usage of system resources.