Abstract: From July 16th through September 21th 1998, Juvenile largemouth bass Micropterus salmoides, trained to accept diets, were stocked into three 6 m-square net cage in reservoir, with stocking densities of 9 fishper cage, the fish average span-length 9.5cm, body-length 8.0cm and weight 9.2g. The two net cage (1#,2#) among fin-clipping were marked by removal of left and/or right abdomen fin each 3 fish, other of 3 individually tagged fish was kept unmarked, and the other one net cage (3#) among 9 individually tagged fish was kept unmarked yet. The fish of 3# net cage artificial feeding enough diminutive small-sized fish species, and fish in 1# and 2# net cage prey by artificial allured small-sized fish species of into the net cage. Result make know:(1) Relationship between three net cage, and fin-clipping were marked or not, growth of largemouth bass Micropterus salmoides difference not salience (p＞0.05); (2) The growth is gradually increscent, the speed of growth rate is sometime soon or sometime slow, and is daily gradually decrease; (3) Average weight were increased 494.4%, daily growth rate were 7.4%; (4) The weight and growth times of largemouth bass Micropterus salmoides is linearity connection, the growth equation: W=8.7655+0.7900D(n=81,p=0.0000,r=0.8555);(5) The growth-mass of largemouth bass Micropterus salmoides is variational, seem follow rule of poor rich poor circle growth; (6) Relationship between weight and body-length of the fish is W=0.00857 L3.3335(P=0.0000,r=0.9905).