A lipase-producing rhizopus arrhizus MHL4.07 was obtained by screening of microorganisms stored in our lab .Under laboratorial conditions, the culture medium of lipase produced by MHL4.07 was studied. The results showed that: The culture time of seed was 84 h.The compositions of optimal fermentation medium(g/l) were: corn steep liquor 40.0, olive oil 12.5, bean cake flour 20.0, NH4Cl 20.0, MgSO4·7H2O 0.5, K2HPO4 1.0, KCl 0.5. Under the optimum conditions the maximum yield of lipase was 41.91 U/ml and it was...