The samples of porcine excreta were collected from 40 pig farms locating in northern. central and southern Taiwan. Under aerobic condition. the mean value of total number of bacteria from the excreta that were non-treated. methane fermented pool, passed thought fish pool, and treated in fecal pool were counted to be 3.9 x 1O’10ml. 1.01 10’5ml. 8.91 l0 ml and 1.6 x 10’9m1, respectively. Ali 1120 bacteria isolates including Eschenchia coli 784 (about 70’o), shigella 101 (about 9°), salmonella 90 (about 8%), proteus 56 (about 5%). The rest of isolates in this survey are chromobacteiium violaceum, aeromonas hvdrophila, citrobacter diversus, enterob acter agglomerans, morganella morganii. pasteurefla znuftocida. vibrio, kiebsiella ozaenae and providencia alcalifacians.