253 lipaseproduction strains were selected from 56 oil contained earth samples.We screened a high lipaseyielding strain named NQ 23 .This strain was identified as Rhizopus based on its characteristic and the lipase activity was increased by 52% after this strain was mutated by UV and DES.In addition,the optimum lipase producing condition and the characteristic of this strain were studied.The results show :The lipase produced by this strain has good thermostability and was stable below 70℃.Its optimum temp...