The purpose of this project. To find out lactic acid bacteria. Sausage isolated from East to bring a starter culture of fermented. Samples from the Kasetsart University. The selection of species from East sausage. Using agar solid MRS to fill in enabling the bromocresol purple and calcium carbonate by selecting the CFU that changes color in enabling the color purple. brown Which can CFU at a different number seven isolates including bacterial isolates N1 and N7 when studying morphological and biochemical reactions. To identify bacterial infection found in the currency N1 N4 N5 and N7 are bacteria in the genus. Lactobacillus SPP. And bacterial isolates N2 N3 and N6 can’t identify the type of bacteria. Then, use bacterial genus Lactobacillus SPP. Isolate N1 N4 N5 and N7 to make samples. The results showed that the bacterial isolates N1 N4 N5 and N7 can’t be affected. But bacterial isolates N2 N3 and N6 can’t be taken as an inoculum. By varying the pH fermentations were started at age 0 hour fermentation in each sample was 6.0, then the pH dropped to 5.7 -5.0 at the age of 12-24 hours, then the value. pH decreased to 4.5 at age fixed at 48 hours of fermentation in all samples. The final pH value is based on the chemical quality of Nham said. The acidity or alkalinity, pH value of less than or equal to 4.6 Nham which this study at the end of fermentation pH of 4.5.