Abstract: The cold-wet climate, and the island-shape permafrost as well as the low-gentle geomorphy are the determination factors of bog formation in this area.The bog in the area formed late, each developing stage has been occurring and its types are complex.The bog in upper stream formed early, and had begun in early Middle Holocene; The bog in middle or lower stream formed late, and had begun in late Holocene. Middle Holocene was the boginess and bog formation period; Late Holocene was the period in which the bog formed extensively and developed. Up to now, there have being developed polytrophic middletrophic, and oligotrophic bog in this area.