Allogynogenetic crucian carp( body weight 1. 6- 2. 2g ) were fed with formulated diet which had been added w ith Chinese herb ( additive ., additive ò) at different contents of 0. 5% , 1% and 2% respectively. Growth rate, apparent digestibility of protein and protease activity in intestine and hepatopancreas were determined in two months. The results showed that Chinese herb additives signif icantly increased growth rate, protease activity in intestine and hepatopancreas, and apparent protein digestibility of allogynogenetic crucian carp( P < 0. 01) . The growth rates of the treated groups 1% of additive ., 2% addit ive . and 2% additive ò were 23. 74% , 32. 74% and 47. 06% higher than those of the control respectively. The effect of the additives on protease activity in intestine and hepatopancreas, and apparent digestibility of protein was the same as the growth rate. Protease act ivities of the control and the treated groups 1% of additive ., 2% addit ive . , 2% additive ò in intestine were 10. 54, 20. 33, 22. 79, 25. 68, and those in hepatopancreas were 8. 54, 14. 13, 16. 59, 20. 36 respectively. Apparent protein digestibities of these groups were 78. 15%, 84. 38%, 86. 98% and 88. 19%. Therefore the increase of the protease activites and absorbabilities was an important factor to increase fish gro