The growth performance of large mouth buffalo stocked in Tongshanyuan Reservoir in the pericKl of 2002-2004 was studied. The results showed large mouth buffalo, whose scales were mainly characterized by incision, was composed of groups aged Ⅱ、Ⅲ、Ⅳ in gill net catches. The relationship between the body-weight and the body-length can be described as W=8.595×10^-515 L^2.662. the growth patterns can be fitted to a Von Bertalanfiy Growth Model, in which L_∞, W_∞, k and t₀ are 36.54cm, 1.245kg, 0.6377 and -0.261 ya respectively. At the broken point of the growth equation of body-weight, t_r=1.92 ya and W_r=0.396kg. The growth of large mouth buffalo in Tongshanyuan Reservoir is slower than that of the fish fanned in ponds.