In order to determine the control effect of Beauveria bassiana emulsifiable powder（EP） on rice water weevil. The control effects of different pesticides on rice water weevil were compared through laboratory and field tests.The results showed that Beauveria bassiana emulsifiable powder had high pathogenicity to rice water weevil, and the control effect of indoor bioassay reached 84.44%, and the control effect of field control reached 69.79%, which was equivalent to the control effect of commercial matrine preparation. It is proved that Beauveria bassiana emulsifiable powder can be used as a biological agent to control rice water weevil in the field.