The finless porpoise is a group of small cetaceans that widely distributed along coastlines of tropical and temperate Asia, from the Persian Gulf east to Japan. While cetaceans generally known as whales, dolphins and porpoises, the genomic information from porpoises is rare known. External morphology and differences in growth and reproduction pattern have distinguished finless porpoise into three geographic populations (Yellow Sea population, the South China Sea population, and the freshwater Yangtze River population) and two corresponding subspecies (N. phocaenoides and N. asiaeorientalis). The finless porpoise genome provides significant contributions to research concerning evolution, genetic diversity and adaptation to aquatic lifestyle and osmoregulation.