Abstract: Forest is one of the most important environmental Capitals, its ecological characteristics is a typical representative to the land ecosystem. Water cycling in the forest ecosystem is the important in the forest ecological function. Also is the most important energy and physical medium. Forest bio-hydrogeology investigation is indispensable in the Natural protecting study. The Nankun mountain natural protecting region bio-hydrogeology characteristics were analyzed in the article to bring the topic for further study together with the on going analysis.