A study of six soil pollen profiles from different vegetation types in the northeast of QinghaiTibet Plateau shows that surface pollen assemblages can reflect the local plant communities well, and extraregion pollen percentages are less than 30%. However the surface pollen assemblages in Betula and Populus forest do not coincide with local vegetation. The loss of Betula pollen in forest needs further investigation. The taphonomy of typical pollen taxa shows：under 8cm of soil surface, total pollen concentrations decrease quickly. Pollen oxidation is serious in the study area. Pollen concentrations decrease by the means of exponent with the increasing of pH values of soil, and decrease sharply as the pH is over 7.6. No obvious pollen downward movement occurred in soil.