89 strains with pectinase activity were isolated from the high quality Daqu starter， the strains with low pectin esterase activity. The liquor fermentation experiments of the optimizing strains was made. A strain of low methanol production was determined by chromatography determination. The strain was identified as Bacillus amyloliquefaciens and named ZS04 by morphology observation， physiological and biochemical analysis and 16SrDNA identification. ZS04 was added by the different inoculation amount in the liquor fermentation， it can inhabit other pectin degrading strains by population dominance， and the methanol content in fermentation broth was reduced. The lowest methanol content was 0.313 mg/100 mL， which was 66.03% lower than the control group. When the inoculation amount was 0.5%， the methanol content was 0.705 mg/100 mL， which was 20.96% lower than the control group， and the ethanol content was 5.77% higher than the control group.