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The diet composition of an invasive population of Shimofuri goby (<i>Tridentiger bifasciatus</i>) was investigated bimonthly during the period from September 2015 through August 2016 in Nansi Lake, a storage lake of the East Route of the South-to-North Water Transfer Project, China. The diet consists of a broad spectrum of prey items, including mollusca (<i>Bellamya</i> sp. and <i>Physa</i> sp.), aquatic insects (Odonata sp., Chironomidae sp., and Cirolanidae sp.), other macroinvertebrates (Nematoda sp. and Rhynchobdellida sp.), shrimp (<i>Palaemon modestus</i> and <i>Gammarus</i> sp.), fish (<i>Rhinogobius giurinus</i> and <i>Tridentiger bifasciatus</i>), fish eggs, and detritus. Dominant diets shifted from Rhynchobdellida sp. and unidentified digested food in July to <i>P. modestus</i> during September and November, and then shifted to both <i>P. modestus</i> and <i>R. giurinus</i>. Additionally, cannibalism was observed in March before spawning season of the goby, during which large males (SL > 70.0 mm) predated on small-sized ones. We suggest that broad spectrum of prey items and apparent seasonal shifting of dominant diets in the invasive goby fish, which might be an important mechanism favoring its successful invasion in water transfer system.