The Tongshan Formation is a very important part of Zalantun-Duobaoshan island arc tectonic belt in northern Zalantun area of the Da Hinggan Mountains. The properties, deposition epoch and tectonic environment type of the source area of Tongshan Formation are important links in the study of the island arc tectonic belt, and also constitute an important window in the study of early tectonic evolution of the old Asian Ocean tectonic domain. The research results provide an important basic material for determining the evolution of the early Paleozoic Zalantun-Duobaoshan island arc tectonic belt and also offer a new constraint for the investigation of the continental crustal evolution on the southern margin of the Siberia plate and the researches on tectono-dynamics.