This study presents the long-term trend of precipitation at Sitou tract in the experimental forest of National Taiwan University. Eleven climate change indices from the 46-year rainfall record were analyzed by using rclimdex of R language in order to diagnose the long-term trned related to climate change. We found that consecutive dry days (CDD) index ascended slowly with time, while consecutive wet days (CWD) index was significantly declined. These two indices revealed the drier trend at Sitou.