The fo od compo sitio n of 1450 specimens o f Perca f luv iat ilis ( 0+ ~ 9 ) in Xin- Jiang Wulunguhu lake w as analyzed, and the fo od compo sit ion and feeding intensity in dif ferent seasons o f dif fer ent age g ro ups w ere compared. The tempo ral and specia l patterns o f feeding niche w ere also resear ched also. Synthesizing the result s of the study w ith the cha racter s o f this f ish in g row th and repro duct ion, it i s revea led that there may be two eco lo gical gr oups, o ne is the gro up preying on benthic a nimals and zoo plankto ns( 0 ~ 2 ) , the o the r is the gro up preying o n pisciv oro us f ishes( t> 3 ) , and mo st indiv iduals of the former ar e of miniatur e bo dy and early-maturing, w hile most o f the lat ter are la rge- sized and late-matur ing. The feeding st rategy o f this species i s discussed also. The results are helpf ul to fur ther study o n its eco log y a nd make success of it s tr ansplantat ion and domest-i cat io n