Abstract: Based on eel’s biological character and principle of protein and fatty metabolism,two kinds of eel additives named Multifunctional Promoting Agent(MPA) "9101" and "9103" have been synthetized,and tested for three times in an eel fishery.The results showed that these two kinds of MPA could raise the growth rate to 26.81% and 25.96%,feed efficiency to 18.66% and 19.60% respectively to compare with the control groups.Each ton feed which containing 10 ppm concentration of MPA could increase net income above 6000 yuan.The trials in eleven eel fisheries also showed coincident results with the small-scale experiment,the efficiency was stable and reliable.It also has a significant recovering effect on runt eels.The products need only small dose with low cost,high profits and merit further popularization.