Abstract: The formation of piacer in Quaternary period was affected by many factors in Altai Mountain, such as regional geological structure, source of minerial, geomorphy, climate, hydro-dynamic, and so on. The activities of magma were frequent, the melamorphism was prevail, With Altai Mountain evolution in geological period, these mentioned above created good conditions of structure and dynamy for the formation of golden rocks and played the substantial foundation for source of placer.
The tectonic movement was relatively stable, climate was hot and moist, chemical and biochemical weathering were intensive from Mesozoic era to Tertiary period in altai Mountain. During this time the mountain continuously undergo weathering and denudation, the elements appeared to migrated and depo-sited in the surface. It resulted in forming residuum. With the formation of the residuum the gold which existed in rocks produced to be accumulated secondarily. Neotectonics and paleoglaciation in Quaternary period made the residuum and golder rocks eroded, and formed abundent fragments which was transported and sedimentated at suitable place. On the other hand neotectonics and fluctuations of glacier made the deposition and erosion change continuously and resulted in forming terrace placer, differece of geonorphy, and the like. As a matter of fact, the formation of placer in Quatermany period was affected by above factors complexly.