The diurnal rhythm of 3 Tibetan fox pups was recorded by focus and instantaneous scan sampling methods between March 6 and April 25,2007,and time budget of these pups were calculated.Resting took most part of daily behavior,hunting and playing were observed frequently.The active period of Tibetan fox pups were concentrated on dawn(8:00-9:00) and dusk(16:00-19:00),and they spent much time on resting in day time.Gamboling,running and intimacy behavior increased and resting behavior decreased when adult fox appeared.