The changing laws of bacteria community in different pit ages of luzhou-flavor liquor pit were analyzed using PCR-SSCP technique. The results were as follows: bands from No. 9 to No. 22 were showed clearly in all pit mud samples, which included 7 bands with higher dominant degree. But the changing laws of dominant degree among bands were different. Besides, the mean diversity index of all samples kept between 1.93 and 2.82. With the increasing pit age, the diversity index of samples from the same spots generally showed increasing trend. The similarity index of PCR-SSCP pattern of samples from different spots in the same pit was higher, between 0.63 and 1.00. While the similarity index of samples from different pit ages was lower, between 0.34 and 0.76.