This paper starts with discussing the harm and characteristics of piggery wastewater, analyses systemically the current domestic and foreign research on piggery wastewater, sums up three kinds of disposal mode: the returning farmland mode, the natural mode and the factory mode, and expatiates the basic treatment methods, the applicable range and the merit and shortcoming of each mode. Considering the high concentration of organic pollutants and its difficult treatment, the writer finds out some problems existing in eurrent research fields on piggery wast...