SRB causes very serious corrosion and usually worsens the environment.A kind of new biocide of bisq-uats named MBQA is successfully synthesized from metronidazole and its structure is illustrated by IR spectrum.Its biociding ability has also been studied.The experiment results show that MBQA has good water solubility.The biociding activity of MBQA is evaluated according to API RP-38standard.The results show that MBQA exhib-ites better inhibitive effect on SRB than1227and metronidazole.