We analyzed images of the Formosan ferret-badger (Melogale moschata subaurantiaca), taken by infrared auto-trigger cameras, used in previous wild mamrnal fauna inventory investigations in Da-Jiou-Shi experimental forest, to determine its daily activity pattern. The daily activity of Formosan ferret-badger presented a strong nocturnal tendency. Before sunset, some individuals started to become active and the activity tendency reached its peak at midnight, and then decreased to zero just before sunrise. The daily activity pattern collected by this study is similar to those stated in other studies in southern Taiwan, however, the activity time span and the peak time appears to be different.