Abstract: In southeast Xizang, there is a tongue-like rainy zone stretching northward, where monsoon maritime glaciers develop with many organisms on the glacial surface. The Ruoguo glacier is one of these. In southeast Xizang the glacial terminal are very low (the lowest 2400 m), and ice tongues extend into subtropical forest. These glaciers closely resemble the maritime glaciers in the Alps and in New Zealand, but differ from the continental type in inland China. In order to confirm the stratigraphy of the annual net accumulation from 1972 to 1975, a detailed analysis of the firn stratigraphy of a 9.30 m deep firn pit on the Ruoguo glacier (4630m. a. s. 1) was carried out. In this paper it is shown that summer and winter layers can be easily distinguished by pollen analysis. The winter layers have a small pollen content while the summer layers have a large pollen content. There are also differences in the spectra of the species which enable a seasonal seperation of the layers. The investigation shows that the layer of annual net accumulation is composed primarily of the winter accumulation, and demonstrates that the displacement of pollen by melt- water incursion is not significant. To examine the accumulation of the different seasons, the samples have to be taken at very close intervals of about 10 cm. If only a separation between summer and winter layers is needed, no detailed exmination of the pollen species is necessary, because of the significant difference in the amount of pollen and spores in the summer and winter layers.